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As far as I know, installing unsigned extensions is also possible in ESR builds, in Firefox from Linux distributions, in Unbranded Builds from Mozilla (but I'm
by artenax 2y ago
As far as I know, installing unsigned extensions is also possible in ESR builds, in Firefox from Linux distributions, in Unbranded Builds from Mozilla (but I'm not sure if they keep older versions). In forks and in your own Firefox builds (from source).