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Safari itself supports extensions

Not Firefox and Chrome extensions though, only a much more limited selection

right, but Firefox only supports Firefox extensions and Chrome Chrome, so what’s your point?

Both Firefox and Chrome implemented Google's EEE WebExtensions format so there's rough parity between the two.

As a result, Firefox extensions got dumber. Bye bye Vimperator, DownThemAll, etc.

oh really? this must have been fairly recently, right?