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WebExtensions (browser extensions) #2271
Mozilla has announced they will come gradually through Firefox 44 to 48, with a stable release in july.
The WebEXtension API is broken in about 60 components; Chrome having 100% support, Opera probably 100% too. The status page for Firefox can be found at http://arewewebextensionsyet.com/
No trace of a public spec by the w3c, unfortunately :/ I don't even know if w3c is involved; but it is really great they are finally making efforts into providing a common API. Maybe they are waiting to have all browsers on the same level before letting w3c evolve the spec.
This mozilla compat table has some useful data, including
Chrome and Opera don’t have 100% support, as Firefox implements some APIs that Chrome solely lacks, and Microsoft is once again doing their own incompatible thing, but this time with Edge’s extensions, instead of IE6.
Anyway, these pages should help:
Actually, Firefox for Android supported extensions for almost as long as Firefox for Android existed because Mozilla isn’t Google, who artifically limit Chrome for Android to prevent people from using third party AdBlockers, which would lessen Google’s ad revenue.