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What's the Firefox version number?

Following on to the last reply, you need at least version 115.13.0esr from July 9, 2024, to use any extensions. See: Update Firefox to prevent add-ons issues from root certificate expiration.

There could still be individual extension issues, so in that case, you could mention the problem extension.

Installation aborted because the add-on appears to be corrupt. This is happening with any extension I try to install since firefox updated to version 148.0 It also broke Ublock on the day firefox updated.