Some Google Chrome extension developers have sold their extensions to third-parties who then incorporated adware.[27][28] In 2014, Google removed two such extensions from the Chrome Web Store after many users complained about unwanted pop-up ads.[29] The following year, Google acknowledged that about five percent of visits to its own websites had been altered by extensions with adware.[30][31][32]

With its own market share in decline, Mozilla also decided to conform. In 2015, the organization announced that the long-standing XUL and XPCOM extension capabilities of Firefox would be replaced with a less-permissive API very similar to Chrome's.[15] This change was enacted in 2017 with the release of Firefox 57.[16][17] Firefox extensions are now largely compatible with their Chrome counterparts.[18]

In 2017, Mozilla enacted major changes to the application programming interface (API) for add-ons in Firefox.[3][4][5] The long-standing XUL and XPCOM capabilities were replaced by an API modeled after Google Chrome's; Firefox extensions are now largely compatible with their Chrome counterparts.[6] Plug-ins were deprecated, with the exception of the Adobe Flash Player.[7]
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