xpinstall.signatures.required >> false
restart firefox

and enjoy your extensions...

@jolek78 and also don't forget to switch back to the default setting once this is solved.

@jolek78 Perfect! I even didn’t have to reinstall them. They all just showed up again.

But don't make update or install new ones. There is no certificate verification so be careful

@jolek78 only for ESR, beta and nightly versions. Not stable ones.

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