I can open Firefox and it works fine on my (admin) user account, as it has for years. Starting today, when my wife is logged in on her account/user on the Mac, when trying to open Firefox there is a prompt "Firefox is trying to install a new helper tool" and requests the admin name and password. I authorized yes to install the helper tool, and then the Firefox icon bounces on the dock indefinitely and Firefox is "not responding" and never opens. If I force quit and try again, I get the same prompt to install the helper tool and the cycle begins again. I think this started after I updated a BitWarden extension on Firefox on my wife's account, but not sure if that is what provoked the problem. The same Bitwarden extension exists on Firefox on the admin account, and that Firefox works fine. What I have tried so far: Shut down all BitWarden apps. Refreshed Firefox on the admin account - which deletes the BitWarden extension. Moved Firefox to the trash. Restart the computer. Re-install Firefox from the admin account (Firefox again works just fine when admin is the user). But Firefox still does not work when another user (my wife) is on her account - same issue with asking to install a helper tool and Firefox never opens. Hardware: MacBook Air M2, Seqouia 15.1 Any help is much appreciated.