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It's working for me, make sure you have the latest Firefox version, there was a bug a few days ago which broke addon-on signature verification.

That was it. Used to Firefox autoupdating, but didn't this time for some reason.

Works fine here. You're on current FFx?

That was it. Used to Firefox autoupdating, but didn't this time for some reason.

uMatrix works in Firefox stable as of last night