Software:Opera (web browser)

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Short description: Freeware web browser
Opera
Opera 2015 icon.svg
Opera Web Browser.png
Opera 60 displaying the Wikipedia main page on Windows 10
Developer(s)Opera
Initial releaseApril 10, 1995; 28 years ago (1995-04-10)[1]
Stable release(s) [±]
100.0.4815.21 (June 20, 2023; 9 months ago (2023-06-20)[2][3][4])
Written inC++[5]
EnginesBlink (formerly Presto), V8
Operating systemWindows 7 or later,[6] macOS, Linux, (Formerly FreeBSD, Nintendo Wii, and Nintendo DSi)
Available in42 languages
TypeWeb browser
LicenseFreeware
Websitewww.opera.com

Opera is a multi-platform web browser developed by its namesake company Opera.[7][8][9] Opera is nowadays a Chromium-based browser. It distinguishes itself from other browsers through its user interface and other features.

Opera was initially released on April 10, 1995, making it one of the oldest desktop web browsers still actively developed today. It was a commercial software for the first ten years and had its own proprietary Presto layout engine. In 2013, Opera switched from the Presto engine to Chromium.

The web browser can be used on Microsoft Windows, Android, iOS, macOS, and Linux operating systems.[10][11] There are also mobile versions called Opera Mobile[12][13] and Opera Mini.[14][15] Additionally, Opera users have access to a news app based on an AI-platform, Opera News.[16]

The company released a gaming-oriented version of the browser called Opera GX in 2019.[17]

History

Main page: Software:History of the Opera web browser

In 1994, Jon Stephenson von Tetzchner and Geir Ivarsoy started developing the Opera web browser while working at Telenor, a Norway telecommunications company.[18][19]

In 1995, they founded Opera Software AS.[20] Opera was initially released on April 10, 1995 and was first publicly released in 1996 with version 2.10,[21] which ran on Microsoft Windows 95.[22] Opera began development of its first browser for mobile device platforms in 1998.[23]

Opera 4.0, released in 2000,[21] included a new cross-platform core that facilitated the creation of editions of Opera for multiple operating systems and platforms.[24]

Up to this point, Opera was trialware and had to be purchased after the trial period ended. Version 5.0 (released in 2000) saw the end of this requirement. Instead, Opera became ad-sponsored, displaying advertisements to users who had not paid for it.[25] Later versions of Opera gave the user the choice of seeing banner ads or targeted text advertisements from Google.

With version 8.5 (released in 2005) the advertisements were completely removed and the primary financial support for the browser came through revenue from Google (which is by contract Opera's default search engine).[26]

Among the new features introduced in version 9.1 (released in 2006) was fraud protection using technology from GeoTrust, a digital certificate provider, and PhishTank, an organization that tracks known phishing web sites.[27] This feature was further expanded in version 9.5, when GeoTrust was replaced with Netcraft, and malware protection from Haute Secure was added.[28]

In 2006, Opera Software ASA was released as well as Internet Channel and Nintendo DS Browser for Nintendo's DS and Wii gaming systems.[29][30][31][32]

A new JavaScript engine called Carakan, after the Javanese alphabet, was introduced with version 10.50.[33] According to Opera Software, Carakan made Opera 10.50 more than seven times faster in SunSpider than Opera 10.10.[34][35][36]

On December 16, 2010, Opera 11 was released, featuring extensions,[37] tab stacking (where dragging one tab over another allows creating a group of tabs), visual mouse gestures and changes to the address bar.[38] Opera 12 was released on June 14, 2012.[39]

On February 12, 2013, Opera Software announced that it would drop its own Presto layout engine in favour of WebKit as implemented by Google's Chrome browser, using code from the Chromium project. Opera Software planned as well to contribute code to WebKit.[40] On April 3, 2013, Google announced that it would fork components from WebKit to form a new layout engine known as Blink. The same day, Opera Software confirmed that it would follow Google in implementing the Blink layout engine.[41]

On May 28, 2013, a beta release of Opera 15 was made available,[42] the first version of which was based on the Chromium project.[43][44] Many distinctive Opera features of the previous versions were dropped, and Opera Mail was separated into a standalone application derived from Opera 12.[45]

In January 2017, the source code of Opera 12.15, one of the last few versions that was still based on the Presto layout engine, was leaked.[46]

To demonstrate how radically different a browser could look, Opera Neon, dubbed a "concept browser," was released in January 2017. PC World compared it to demo models that automakers and hardware vendors release to show their visions of the future. Instead of a Speed Dial (also explained in the following chapter "Features"), it displays the frequently accessed websites in resemblance to a desktop with computer icons scattered all over it in an artistic formation.[47][48]

Features

Main page: Features of the Opera web browser

Opera has originated features later adopted by other web browsers, including: Speed Dial, pop-up blocking, re-opening recently closed pages, private browsing, and tabbed browsing.[49][50] Additional features include a built-in screenshot tool called Snapshot which also includes an image-markup tool,[51] built-in ad blockers and tracking blockers.[52]

Built-in messengers

Opera’s desktop browser includes access to social media messaging apps WhatsApp, Telegram, Facebook Messenger, Twitter, Instagram, and VKontakte.[53][54]

Usability and accessibility

Opera includes a bookmarks bar and a download manager. It also has "Speed Dial" which allows the user to add an unlimited number of pages shown in thumbnail form in a page displayed when a new tab is opened.[49][50][55]

Opera was one of the first browsers to support Cascading Style Sheets (CSS) in 1998.[56]

Opera Turbo, a feature that compresses requested web pages (except HTTPS pages) before sending them to the users,[57] is no longer available on the desktop browser. Opera Turbo is available in Opera Mini, the mobile browser.[58]

Privacy and security

One security feature is the option to delete private data, such as HTTP cookies, browsing history, items in cache and passwords with the click of a button.[59]

When visiting a site, Opera displays a security badge in the address bar which shows details about the website, including security certificates.[60] Opera's fraud and malware protection warns the user about suspicious web pages and is enabled by default. It checks the requested page against several databases of known phishing and malware websites, called blacklists.[60]

In 2016, a free virtual private network (VPN) service was implemented in the browser.[61] Opera said that this would allow encrypted access to websites otherwise blocked, and provide security on public WiFi networks.[62][63] It was later determined that the browser VPN operated the same as a proxy rather than other VPN services.[64]

Crypto wallet support

In 2018, a built-in cryptocurrency wallet to the Opera Web Browser was released,[65] announcing that they would be the first browser with a built-in Crypto Wallet.[66] On December 13, 2018, Opera released a video showing many decentralized applications like Cryptokitties running on the Android version of the Opera Web Browser.[67]

In March 2020, Opera updated its Android browser to access crypto domains, making it the first browser to be able to support a domain name system (DNS) which is not part of the traditional DNS directly without the need of a plugin or add-on.[68] This was through a collaboration with a San Francisco based startup, Unstoppable Domains.[69][70]

Other versions

Opera GX

Opera GX
Opera GX Icon.svg
Opera GX screenshot.png
A screenshot of Opera GX on macOS Mojave
Developer(s)Opera Poland
Initial releaseJune 11, 2019; 4 years ago (2019-06-11)
Stable release
79.0.4143.73 (September 29, 2021)
EnginesBlink, V8
Operating systemMicrosoft Windows
macOS
Beta:
iOS
Android
TypeWeb browser
LicenseFreeware
Websitewww.opera.com/gx

Opera GX is a gaming-oriented counterpart of Opera. The browser was announced and released in early access for Windows on June 11, 2019, during E3 2019. The macOS version was released in December of the same year.[71][72]

Opera GX adds features geared towards gamers on top of the regular Opera browser. The browser allows users to limit network, CPU, and memory usage to preserve system resources. It also adds integrations with other apps such as Twitch, Discord, and Instagram. The browser also has a built-in page called the GX Corner, which collates gaming-related releases, deals, and news articles.[73][74][75]

On May 20, 2021, Opera released a mobile version of Opera GX in beta for iOS and Android.[76]

Development stages

Opera Software uses a release cycle consisting of three "streams," corresponding to phases of development, that can be downloaded and installed independently of each other: "developer," "beta," and "stable." New features are first introduced in the developer build, then, depending on user feedback, may progress to the beta version and eventually be released.[77]

The developer stream allows early testing of new features, mainly targeting developers, extension creators, and early adopters. Opera developer is not intended for everyday browsing as it is unstable and is prone to failure or crashing, but it enables advanced users to try out new features that are still under development, without affecting their normal installation of the browser. New versions of the browser are released frequently, generally a few times a week.[78]

The beta stream, formerly known as "Opera Next," is a feature complete package, allowing stability and quality to mature before the final release. A new version is released every couple of weeks.[79]

Both streams can be installed alongside the official release without interference. Each has a different icon to help the user distinguish between the variants.

Market adoption

Further information: Software:Usage share of web browsers
Desktop/laptop/tablet browser statistics
Google Chrome
 
 64.42%
Apple Safari
 
 12.60%
Mozilla Firefox
 
 7.88%
Microsoft Edge
 
 6.96%
Opera
 
 2.47%
Internet Explorer
 
 2.38%
Desktop and tablet web browser market share according to StatCounter for December 2020.[80]

Integrations

In 2005, Adobe Systems integrated Opera's rendering engine, Presto, into its Adobe Creative Suite applications. Opera technology was employed in Adobe GoLive, Adobe Photoshop, Adobe Dreamweaver, and other components of the Adobe Creative Suite.[81][82] Opera's layout engine is also found in Virtual Mechanics SiteSpinner Pro.[83] The Internet Channel is a version of the Opera 9 web browser for use on the Nintendo Wii created by Opera Software and Nintendo.[84] Opera Software is also implemented in the Nintendo DS Browser for Nintendo's handheld systems.

Opera is one of the top 5 browsers used around the world.[85][86] As of April 2021, Opera's offerings had over 320 million active users.[87]

Reception

The Opera browser has been listed as a “tried and tested direct alternative to Chrome.”[88] It scores close to Chrome on the HTML5test, which scores browsers’ compatibility with different web standards.[86]

Versions with the Presto layout engine have been positively reviewed,[89][90][91] although they have been criticized for website compatibility issues.[92][93] Because of this issue, Opera 8.01 and higher had included workarounds to help certain popular but problematic web sites display properly.[94][95]

Versions with the Blink layout engine have been criticized by some users for missing features such as UI customization, and for abandoning Opera Software's own Presto layout engine.[96][97][98][99] Despite that, versions with the Blink layout engine have been noted for being fast and stable, for handling the latest web standards and for having a better website compatibility and a modern-style user interface.[100][101][102]

See also

Opera browser platform variants:

Related other browsers:

  • Otter Browser: an open-source browser that recreates some aspects of the classic Opera
  • Vivaldi: a freeware browser created by former Opera Software employees

Related topics:

References

  1. ↑ "Opera version history — Opera 1 series". Opera Software. February 21, 2012. http://www.opera.com/docs/history/presto/#o1. 
  2. ↑ "Thanks for downloading Opera" (in en-US). Opera Norway. https://download.opera.com/download/get/?partner=www&opsys=Windows. Retrieved 21 June 2023. 
  3. ↑ "Thanks for downloading Opera" (in en-US). Opera Norway. https://download.opera.com/download/get/?partner=www&opsys=MacOS. Retrieved 21 June 2023. 
  4. ↑ "Index of /ftp/pub/opera/desktop/100.0.4815.21/" (in en-US). Opera Norway. https://get.opera.com/ftp/pub/opera/desktop/100.0.4815.21/. Retrieved 21 June 2023. 
  5. ↑ Lextrait, Vincent (July 2010). "The Programming Languages Beacon, v10.3". http://www.lextrait.com/Vincent/implementations.html. 
  6. ↑ "Opera system requirements". Opera Software. https://www.opera.com/download/requirements. 
  7. ↑ "About Opera - Innovation is our game - Opera". https://www.opera.com/about. 
  8. ↑ "Opera Limited American Depositary Shares (OPRA)". https://www.nasdaq.com/symbol/opra. 
  9. ↑ "Chinese consortium buys Opera browser for $600 mn" (in en-us). https://phys.org/news/2016-07-chinese-consortium-opera-browser-mn.html. 
  10. ↑ "Opera Touch is a solid alternative to Safari on the iPhone" (in en-US). https://social.techcrunch.com/2018/10/02/opera-touch-ios/. 
  11. ↑ "Best web browser 2020: Chrome, Edge, Firefox, and Opera go head-to-head" (in en). 2020-04-17. https://www.pcworld.com/article/3213031/best-web-browsers.html. 
  12. ↑ "Opera is the oldest browser, and it is still surviving: Jon Tetzchner, founder, Opera software". The Economic Times. https://economictimes.indiatimes.com/opinion/qna/opera-is-the-oldest-browser-and-it-is-still-surviving-jon-tetzchner-founder-opera-software/articleshow/7068303.cms. 
  13. ↑ "Opera update uses QR codes to sync data between PC and Android browsers" (in en). https://www.engadget.com/opera-makes-it-easier-to-sync-between-pc-and-android-versions-074206375.html. 
  14. ↑ Brügger, Niels; Milligan, Ian (2018-12-10) (in en). The SAGE Handbook of Web History. SAGE. ISBN 978-1-5264-5546-8. https://books.google.com/books?id=PENeDwAAQBAJ&q=opera+mini+2005&pg=PT520. 
  15. ↑ "Opera launches a new mobile browser" (in en-US). https://social.techcrunch.com/2018/04/25/opera-launches-a-new-mobile-browser/. 
  16. ↑ "Opera News Sets a New Record With 200 Million Users" (in en-US). 2020-06-09. https://martechseries.com/technology/opera-news-sets-new-record-200-million-users/. 
  17. ↑ "Opera GX | Gaming Browser | Opera". https://www.opera.com/gx. 
  18. ↑ "From Norwegian research project to global multiplatform browser. Opera company profile". 2020-02-14. https://adsider.com/from-norwegian-research-project-to-global-multiplatform-browser-opera-company-profile/. 
  19. ↑ Sengupta, Debjoy. "Opera is the oldest browser, and it is still surviving: Jon Tetzchner, founder, Opera software". The Economic Times. https://economictimes.indiatimes.com/opinion/qna/opera-is-the-oldest-browser-and-it-is-still-surviving-jon-tetzchner-founder-opera-software/articleshow/7068303.cms. 
  20. ↑ "About Opera". Opera Software. http://www.opera.com/company/. 
  21. ↑ 21.0 21.1 "Affiliated Organization of Firefox and Mozilla". Mozilla Foundation. 2006. http://www.foxkeh.com/downloads/history/history-original.pdf. 
  22. ↑ "Milestones". Opera Software. 2007. http://www.opera.com/company/history/. 
  23. ↑ "Can Opera Become to Mobile What Firefox has Become to the Computer?" (in en-US). 2008-11-12. https://www.fastcompany.com/1079768/can-opera-become-mobile-what-firefox-has-become-computer. 
  24. ↑ Schenk, Mark (2010). "Opera browser version history". http://www.markschenk.com/various/ohistory/index.html. 
  25. ↑ Lettice, John (December 6, 2000). "Opera browser goes free with version 5.0 launch". https://www.theregister.co.uk/2000/12/06/opera_browser_goes_free/. 
  26. ↑ Baker, Loren (September 20, 2005). "Opera Goes Free with Help from Google". http://www.searchenginejournal.com/opera-goes-free-with-help-from-google/2227/. 
  27. ↑ Goldman, Daniel (December 18, 2006). "Opera 9.1 is out with Fraud Protection". http://operawatch.com/news/2006/12/opera-91-is-out-with-fraud-protection.html. 
  28. ↑ Kleinhout, Huib (June 6, 2008). "Malware protection". Opera Software. http://my.opera.com/desktopteam/blog/2008/06/06/malware-protection. 
  29. ↑ "Giving gamers two windows to the Web: The Opera Browser for Nintendo DS" (Press release). Opera Software. 15 February 2006. Retrieved June 11, 2014.
  30. ↑ "Nintendo DS Browser available to North American market" (Press release). Opera Software. June 8, 2007. Retrieved June 11, 2014.
  31. ↑ "A Web Revolution in the Living room: Opera partners with Nintendo to put browser on the Wii game console" (Press release). Opera Software. May 10, 2006. Retrieved June 11, 2014.
  32. ↑ "Play with the Web: Opera browser now available for download on Wii" (Press release). Opera Software. December 22, 2006. Retrieved 11 June 2014.
  33. ↑ "Opera 10.50 for Windows changelog (Final)". Opera Software. March 2, 2010. http://www.opera.com/docs/changelogs/windows/1050/. 
  34. ↑ Mateu, Roberto (January 1, 2010). "Opera 10.5 pre-alpha for Labs". Opera Software. http://labs.opera.com/news/2009/12/22/. 
  35. ↑ De, Pallab (22 December 2009). "Opera 10.5 Pre-Alpha Is Here and It Is Fast!". http://techie-buzz.com/opera/opera-10-5-pre-alpha-is-here-and-it-is-fast.html. 
  36. ↑ Purdy, Kevin (December 22, 2009). "Opera 10.5 Pre-Alpha is All About Speed (and Private Browsing)". Gawker Media. http://lifehacker.com/5432054/opera-105-pre+alpha-is-all-about-speed-and-private-browsing. 
  37. ↑ Protalinski, Emil (October 21, 2010). "Opera 11 alpha out: developers, start your extension engines". Ars Technica. https://arstechnica.com/information-technology/2010/10/opera-11-alpha-out-developers-start-your-extension-engines/. 
  38. ↑ "Opera 11.00 for Windows changelog". Opera Software. http://www.opera.com/docs/changelogs/windows/1100/. 
  39. ↑ "Opera 12.00 for Windows Changelog". Opera Software. June 14, 2012. http://www.opera.com/docs/changelogs/windows/1200/. 
  40. ↑ "Hey Presto, Opera switches to WebKit". Condé Nast. February 13, 2013. https://arstechnica.com/information-technology/2013/02/hey-presto-opera-switches-to-webkit/. 
  41. ↑ Opera Desktop Team - Opera Next 15 Released!. My.opera.com (May 28, 2013). Retrieved on July 21, 2013.
  42. ↑ Opera Developer News - A first peek at Opera 15 for Computers. My.opera.com (28 May 2013). Retrieved on July 21, 2013.
  43. ↑ The Chromium-Powered Opera Is Finally Here. WebProNews (May 28, 2013). Retrieved on July 21, 2013.
  44. ↑ Standalone Opera Mail Client Coming to Linux. Omgubuntu.co.uk (May 28, 2013). Retrieved on July 21, 2013.
  45. ↑ Presto engine source code available on GitHub (2017)
  46. ↑ Hachman, Mark (January 11, 2017). "Meet Opera Neon, Opera's radical vision for the future of web browsers". PCWorld. https://www.pcworld.com/article/3156970/browsers/meet-opera-neon-operas-radical-vision-for-the-future-of-web-browsers.html. 
  47. ↑ Muchmore, Michael (January 11, 2017). "Opera Neon". https://www.pcmag.com/review/350974/opera-neon. 
  48. ↑ 49.0 49.1 "5 features Opera Browser did first". SlashGeek. http://www.slashgeek.net/5-features-opera-browser-did-first/. 
  49. ↑ 50.0 50.1 Reimer, Jeremy (1 September 2009). "First look: Opera 10 faster with new features". Condé Nast. https://arstechnica.com/gadgets/2009/09/first-look-opera-10-faster-with-new-features/. 
  50. ↑ Salter, Jim (2020-02-26). "Ars takes the new Opera R2020 browser for a spin" (in en-us). https://arstechnica.com/gadgets/2020/02/browser-review-opera-r2020-and-opera-touch-are-well-worth-a-look/. 
  51. ↑ "Do you know who made that browser extension? Opera highlights how its VPN, ad-blocker are in-built" (in en). 2020-09-24. https://indianexpress.com/article/technology/tech-news-technology/opera-says-there-is-no-reason-for-its-browser-to-collect-any-data-6607734/. 
  52. ↑ "Opera has baked Twitter into its desktop browser" (in en). https://www.engadget.com/opera-twitter-desktop-browser-070012489.html. 
  53. ↑ "Opera's desktop browser now features quick access to Messenger, Whats App, and Telegram" (in en-US). https://social.techcrunch.com/2017/05/10/operas-desktop-browser-now-features-quick-access-to-messenger-whatsapp-and-telegram/. 
  54. ↑ "Opera version history". Opera. http://www.opera.com/docs/history/presto/#o40. "Opera has a history of introducing new features long before they become mainstream, and often failing to receive credit for doing so. Opera was the first browser to [...]" 
  55. ↑ Meyer, Eric (June 1999). "CSS: If not now, when?". http://meyerweb.com/eric/articles/webrev/199906.html. 
  56. ↑ "Opera's company FAQ". Opera Software. http://www.operasoftware.com/press/faq. 
  57. ↑ "The best browser 2021" (in en). https://www.techradar.com/best/browser. 
  58. ↑ "Help, Be safe and private". Opera Software. http://help.opera.com/opera/Windows/1116/en/private.html. 
  59. ↑ 60.0 60.1 "Security and privacy". https://help.opera.com/en/latest/security-and-privacy/. 
  60. ↑ "Free VPN". http://www.opera.com/computer/features/free-vpn. 
  61. ↑ "Opera Free VPN - Unlimited WiFi Security & Content Unblocking - Free VPN for online security, unblocking content and encrypting your web traffic.". 2017. https://www.operavpn.com/. 
  62. ↑ Opera Settings > VPN: "Enabling VPN will disable Opera Turbo"
  63. ↑ Špaček, Michal (22 April 2016). "Opera VPN behind the curtains is just a proxy, here's how it works". https://gist.github.com/spaze/558b7c4cd81afa7c857381254ae7bd10. 
  64. ↑ "The Opera browser for Android with built-in Crypto Wallet - OPERA - BROWSER". https://youtube.com/watch?v=aq5yJ0TqhbY. 
  65. ↑ "Opera introduces first browser with built-in Crypto Wallet - Opera". December 14, 2018. http://www.operasoftware.com/press/releases/mobile/2018-07-11. 
  66. ↑ "The Opera browser for Android with built-in Crypto Wallet - OPERA - BROWSER". https://www.youtube.com/watch?v=aq5yJ0TqhbY. 
  67. ↑ at 07:04, Kieren McCarthy in San Francisco Mar 31, 2020. "Sucks to be you, ICANN. We can go our own way: Opera to support sites using renegade top-level domain .crypto" (in en). https://www.theregister.co.uk/2020/03/31/opera_android_dot_crypto/. 
  68. ↑ "Unstoppable Domains Partners With Opera Browser to Integrate Decentralized Websites" (in en). 2020-03-30. https://www.businesswire.com/news/home/20200330005064/en/Unstoppable-Domains-Partners-Opera-Browser-Integrate-Decentralized. 
  69. ↑ "Unstoppable Domains". https://unstoppabledomains.com/. 
  70. ↑ Kastrenakes, Jacob (2019-06-11). "Opera made a 'gaming browser' that lets you control CPU usage". https://www.theverge.com/2019/6/11/18659842/opera-gx-gaming-browser-released-cpu-ram-limits. 
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  72. ↑ "Opera GX Review" (in en). https://www.pcmag.com/reviews/opera-gx. 
  73. ↑ Hesse, Brendan (2021-01-22). "Is the Opera GX Browser Just for Gamers?". https://lifehacker.com/is-the-opera-gx-browser-just-for-gamers-1846105831. 
  74. ↑ "Opera GX gets built-in Instagram, workspaces to keep tabs organized". 2020-05-19. https://www.windowscentral.com/opera-gx-gets-built-instagram-workspaces-keep-tabs-organized. 
  75. ↑ Kocemba, Maciej (May 20, 2021). "Opera GX Mobile beta is here – Great News for Gamers on the Go". https://blogs.opera.com/desktop/2021/05/opera-gx-mobile-beta/. 
  76. ↑ "What is Opera, Opera next, and Opera developer?". http://blogs.opera.com/desktop/streams/. 
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  78. ↑ "Opera beta". Opera Software ASA. http://www.opera.com/beta. 
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  80. ↑ "Powered by Opera: Opera Integrated with Adobe Creative Suite 2" (Press release). Opera Software. 4 April 2005. Retrieved 11 June 2014.
  81. ↑ Goldman, Daniel (May 3, 2007). "Dreamweaver uses Opera's Small-Screen Rendering technology to preview webpages for mobile phones". http://operawatch.com/news/2007/05/dreamweaver-uses-operas-small-screen-rendering-technology-to-preview-webpages-for-mobile-phones.html. 
  82. ↑ "Design Web Pages for the Desktop and Mobile Devices" (Press release). Virtual Mechanics Inc. November 17, 2008. Archived from the original on 9 January 2009. Retrieved 11 June 2014.
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  84. ↑ "Now Live With Latest Chrome, Firefox, Edge, and Opera Browsers" (in en-US). https://www.lambdatest.com/blog/now-live-with-latest-chrome-firefox-edge-opera-browsers/. 
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  86. ↑ Opiah, Abigail (2021-04-28). "Opera upgrades user access to decentralized web via Unstoppable Domains". https://www.techradar.com/news/opera-upgrades-user-access-to-decentralized-web-via-unstoppable-domains. 
  87. ↑ "Vivaldi, Opera, Brave: should you switch your browser?" (in en). https://www.technologymagazine.com/digital-transformation/vivaldi-opera-brave-should-you-switch-your-browser. 
  88. ↑ Stieben, Danny (May 24, 2012). "5 Ideological Reasons Why You Should Try Opera". http://www.makeuseof.com/tag/5-ideological-reasons-why-you-should-try-opera/. 
  89. ↑ Mason, Wesley (March 16, 2000). "Software Review: Opera browser for Windows v3.62". http://www.geek.com/hwswrev/software/opera/opera2.htm. 
  90. ↑ Berger, Sandy (November 3, 2004). "Opera Web Browser". http://www.compukiss.com/populartopics/research_infohtm/review386.htm. 
  91. ↑ Altman, Tim (August 31, 2007). "Focus Areas during Kestrel Development". Opera Software. http://my.opera.com/desktopteam/blog/2007/08/31/focus-areas-during-kestrel-development. 
  92. ↑ Dotzler, Asa (4 September 2007). "Firefox and more". http://weblogs.mozillazine.org/asa/archives/2007/09/opera_95_alpha.html. 
  93. ↑ "Browser JavaScript Explained". Opera Software. http://www.opera.com/docs/browserjs/. 
  94. ↑ "Changelog for Opera 8.01 for Windows". Opera Software. http://www.opera.com/docs/changelogs/windows/801/. 
  95. ↑ Harac, Ian (9 December 2013). "Opera 18 review: This browser's seen radical changes… perhaps too radical". IDG. http://www.pcworld.com/article/2068265/opera-18-review-this-browsers-seen-radical-changes-perhaps-too-radical.html. 
  96. ↑ Samson, Ted. "Blink-based Opera 15 strikes a sour note with users". IDG. http://www.infoworld.com/t/web-browsers/blink-based-opera-15-strikes-sour-note-users-222025. 
  97. ↑ Mathews, Lee (July 2, 2013). "Opera 15 launches, turns out to be a crippled Google Chrome". Ziff Davis. http://www.geek.com/apps/opera-15-launches-turns-out-to-be-a-crippled-google-chrome-1560844/. 
  98. ↑ Keizer, Gregg. "Opera 15 launches with WebKit backbone". https://www.computerworld.com/s/article/9240534/Opera_15_launches_with_WebKit_backbone. 
  99. ↑ Le Bihan, Alan (May 26, 2014). "A browser that's free, comprehensive and innovative". http://opera.en.softonic.com/. 
  100. ↑ Piccolomini, Pier Francesco (September 5, 2013). "5 Alternatives to Internet Explorer". http://features.en.softonic.com/5-alternatives-to-internet-explorer. 
  101. ↑ Hughes, Matthew (August 6, 2013). "Opera 15 Is A Faster, Simpler Chrome, And Here Are 3 Great Reasons To Try It". http://www.makeuseof.com/tag/opera-15-is-a-faster-simpler-chrome-and-here-are-3-great-reasons-to-try-it/. 

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