Opera 10.53 for Windows

Opera runs on a variety of personal computer operating systems, including Microsoft Windows, Mac OS X, Linux, FreeBSD, the iPhone OS, and Solaris. Evaluations of Opera have been largely positive, and Opera has innovated many key features of modern browsers. Despite these factors, Opera has captured only a small fraction of the worldwide personal computer browser market. It does, though, have a stronger market share on mobile devices such as mobile phones, smartphones, and personal digital assistants. Editions of Opera are available for devices using the Symbian and Windows Mobile operating systems, as well as Java ME-enabled devices. Approximately 100 million mobile phones have been shipped with Opera pre-installed. Opera is the only commercial web browser available for the Nintendo DS and Wii gaming systems. Some television set-top boxes use Opera. Adobe Systems has licensed Opera technology for use in the Adobe Creative Suite.
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Opera began in 1994 as a research project at Telenor, the largest Norwegian telecommunications company. In 1995, it branched out into a separate company named Opera Software ASA. Opera was first released publicly with version 2.0 in 1996, which only ran on Microsoft Windows. In an attempt to capitalize on the emerging market for Internet-connected handheld devices, a project to port Opera to mobile device platforms was started in 1998. Opera 4.0, released in 2000, included a new cross-platform core that facilitated creation of editions of Opera for multiple operating systems and platforms.

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. 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 removed entirely and primary financial support for the browser came through revenue from Google (which is by contract Opera's default search engine).

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. This feature was further improved and expanded in version 9.5, when GeoTrust was replaced with Netcraft, and malware protection from Haute Secure was added.

Also in 2006, editions of Opera were made and released for Nintendo's DS and Wii gaming systems. Opera for the Wii, called the Internet Channel, was free to download from its release on 12 April 2007 until 30 June 2007. After that date, Wii users had to pay 500 Wii Points (about US$5) to download it. As of 2 September 2009, it is again free to download. Users who previously paid to download it will be offered a NES game of their choice to the same value. The Nintendo DS Browser is not free; it is sold as a physical DS game cartridge. The DSi has an Internet Channel that can be downloaded for free from the DSi shop.

A new JavaScript engine called Carakan, after the Javanese script, was introduced with version 10.50. According to Opera Software, Carakan is more than seven times faster in SunSpider than Opera 10.10 with Futhark on Windows, which has since been more or less confirmed by other sources after its official pre-alpha release in December 2009. Also introduced was Opera's vector graphics library, Vega, which handles all of the browser's rendering. This allows platform specific rendering code to be replaced with code for Vega, which makes it easier to deploy across platforms; aids Opera's implementation of some advanced CSS3 properties, such as backgrounds and borders; and also allows hardware acceleration with optional OpenGL and Direct3D backends.
Features
Main article: Features of the Opera web browser
See also: Opera Mobile#Features, Opera Mini#Features, Nintendo DS & DSi Browser#Features, and Internet Channel#Features

One set of third-party speed tests concluded that Opera 9.5 was indeed faster than Internet Explorer 7 and prerelease versions of Firefox 3 and Safari 3. Technology website ZDNet's speed tests in early 2008 showed that out of Internet Explorer 7, Safari 3, and pre-release versions of Firefox 3 and Opera 9.5, Opera was the fastest in some areas, but the only browser that Opera clearly outperformed was Internet Explorer. However, as of Opera 10.50 (codenamed Evenes)—which has been released for Windows, and currently is in the pre-release stage for Mac and UNIX—features a new JavaScript engine (codenamed Carakan), as well as a new vector graphics library (codenamed Vega), which together significantly increase Opera's overall rendering speed.

Opera includes built-in tabbed browsing, ad blocking, fraud protection, a download manager and BitTorrent client, a search bar, and a web feed aggregator. Opera also comes with an e-mail client called Opera Mail and an IRC chat client built in.

Opera includes a "Speed Dial" feature, which allows the user to add up to 25 links (or more, by editing the speeddial.ini file) shown in thumbnail form in a page displayed when a new tab is opened. Thumbnails of the linked pages are automatically generated and used for visual recognition on the Speed Dial page or can be modified using Opera Image Dial Generator. Once set up, this feature allows the user to more easily navigate to the selected web pages. Note that editing the speeddial.ini located in the directory file (which is in an OS-dependent location) of Opera gives the user better control of the look of the new tab. It gives the ability to edit the number of columns and rows separately, and recently the opacity of thumbnails for better visibility of the background image.

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