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Add-on is the Mozilla term for software modules that can be added to lớn the Firefox trang web browser and related applications. Mozilla hosts them on its official add-on trang web.
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Browser extensions are the primary type of add-on. In 2017, Mozilla enacted major changes to lớn the application programming interface (API) for extensions in Firefox, replacing the long-standing XUL and XPCOM APIs with the WebExtensions API that is modeled after Google Chrome's API. Thus add-ons that remain compatible with Firefox are now largely compatible with Chrome as well. As of December, 2022, there are close to lớn 30,000 add-ons and over 480,000 themes available for Firefox.
Starting with Firefox 57, only the new WebExtensions API is supported.
Early versions of Firefox supported themes that could greatly change the appearance of the browser, but this was scaled back over time. Current themes are limited to lớn changing the background and text color of toolbars. (These lightweight themes were formerly called personas.)
Prior to lớn 2017, Firefox supported extensions developed with different APIs: XUL, XPCOM, and Jetpack. Mozilla now refers to lớn these as legacy extensions.
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Plug-ins are no longer supported in Firefox. In the past, they were used to lớn handle truyền thông media types for which the application did not have built-in capability. They were deprecated due to lớn security concerns and improvements in Web APIs. The last one that was officially supported was Adobe Flash Player, which Adobe discontinued in 2020.
Mozilla had no mechanism to lớn restrict the privileges of legacy Firefox extensions. This meant that a legacy extension could read or modify the data used by another extension or any tệp tin accessible to lớn the user running Mozilla applications. But the current WebExtensions API imposes many restrictions.
Starting with Firefox 40, Mozilla began to lớn roll out a requirement for extension signing. It is now required in all official Firefox releases.
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Type of site
|Registration||Free; only needed for developers or for special features|
The Mozilla add-ons trang web is the official repository for Firefox add-ons. In contrast to lớn mozdev.org which provides không tính phí hosting for Mozilla-related projects, the add-ons site is tailored for users. By mặc định, Firefox automatically checks the site for updates to lớn installed add-ons.
In January 2008, Mozilla announced that the site had accumulated a total of 600 million add-on downloads and that over 100 million installed add-ons automatically kiểm tra the site for updates every day. In July 2012, the total had increased to lớn 3 billion downloads from the site.
- Official add-on website
- WebExtensions API reference documentation
- Extension Workshop, Mozilla's site for Firefox extension developer documentation