Add-on (Mozilla)

Themes 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 changing the background and text color of toolbars, formerly called personas, now called Firefox Themes. WebExtensions Starting with Firefox 57, only the new WebExtensions API is supported for extensions, relegating the older extension technology as legacy. Legacy extensions Prior to 2017, Firefox supported extensions developed via various APIs: XUL, XPCOM, and Jetpack. Mozilla now refers to these as legacy extensions. The last one that was officially supported was Adobe Flash Player, which Adobe discontinued in 2020. ==Security==

Mozilla had no mechanism to 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 file accessible to the user running Mozilla applications. But the current WebExtensions API imposes security restrictions. Starting with Firefox 40, Mozilla began to roll out a requirement for extension signing. It is now required in all official Firefox releases. ==Website==

The Mozilla add-ons website is the official repository for Firefox 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 check the site for updates every day. In July 2012, the total had increased to 3 billion downloads from the site. ==References==