I haven't tried to bisect this using mozregression (also given that Alex did have an issue on some intermediate nightly build, which sounds like unrelated to this particular bug), but I took a quick look to 1password xpi to double-check if it was using internally initKeyEvent (which was a non standard and deprecated method and we disabled it in Firefox 93 as part of Bug 1717760), Bitwarden (which is also a password manager extension) did also have a regression reported recently on Nightly 9 for that reason (Bug 1724925).
1Password 6.8 MAC OS X
I bought 1password in the era where it was 1 time buy advertised in 2017. Then my application stopped to work and was trying to force me for subscription and that was the last time i used the application. i hate when i pay and cant use the app..
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