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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.[38]

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.

Opera supports "Opera Widgets", small web applications that start from within Opera. Alongside Widgets, "User JavaScript" may be used to add custom JavaScript to web pages. Greasemonkey support is limited, and there is no interface to manage scripts or toggle 'Greasemonkey-on' functionality.

Opera is extensible in a third way via plug-ins, relatively small programs that add specific functions to the browser. However, Opera limits what plug-ins can do and does not support full-fledged third-party extensions to the browser. Opera does this as a quality assurance measure, so that third-party extensions cannot introduce bugs.

(+) Advantages:
- Have their own email and rss client, so no need to use other email clients like Outlook, Thunderbird and other
- The callback fast Cache

(-) Disadvantages:
- A bit slow in reading the script on multiple pages site
- To update it should download the master file back

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More to www.opera.com