This is disappointing. Everything is becoming centralized, even Firefox extensions. I wish there was an opt out like "unknown sources" in android, but they keep saying we're not smart enough to make or own decisions. They won't even put one in about:config. This change well undoubtedly upset developers and other techy folk, exactly the kind of people you want working with your software.
Fdroid is working on third party repositories, maybe that will catch on to decentralize the mobile world a bit. Something like that for browser extensions would be sweet. Take a look at Fennec Fdroid for a cleaner Firefox mobile experience at least.
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