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| Browser extension ： ウィキペディア英語版 |
Browser extension
A browser extension is a computer program that extends the functionality of a web browser in some way. Depending on the browser and the version, the term may be distinct from similar terms such as plug-in or add-on. Some extensions are authored using web technologies such as HTML, JavaScript, and CSS.〔(【引用サイトリンク】url=http://developer.chrome.com/extensions/index.html )〕 Browser extensions can change the user interface of the web browser without directly affecting viewable content of a web page; for example, by adding a "toolbar."
==History==
Microsoft Internet Explorer started supporting extensions from version 5 released in 1999.〔(【引用サイトリンク】url=http://msdn.microsoft.com/en-us/library/aa753587(VS.85).aspx )〕 Mozilla Firefox has supported extensions since its launch in 2004. The Opera desktop web browser supported extensions from version 10 released in 2009. Google Chrome started supporting extensions from version 4 released in 2010. The Apple Safari web browser started supporting native extensions from version 5 released in 2010. The syntax for extensions may be quite different from browser to browser, or at least enough different that an extension working on a browser does not work on another one. As for search engine tools, an attempt to bypass this problem is the multitag strategy proposed by the project Mycroft, a database of search engine addons working on different browsers.〔(【引用サイトリンク】url=http://mycroft.mozdev.org/index.html )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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