Steps to replicate the issue (include links if applicable):

• Go on Wikipedia
• Log in to your account on Firefox (this does not happen while logged out or on Chromium)
• Switch to the Vector 2022 skin if you're not already using it
• Try to use Alt + Shift + Y, Alt + Shift + N or Alt + Shift + L

What happens?:
Nothing for the first two. The third one selects the Watchlist button but does not actually open the watchlist until you press Enter.

What should have happened instead?:
The User Contributions, the User Talk page or the Watchlist respectively should have opened immediately. This is what happens on Chromium. If you log out, the first two shortcuts will work correctly on Firefox as well (there is no watchlist for logged out users).

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):
I've replicated this on Windows 10 and 11 on various versions of Firefox. It still happens on 141.0. Safemode does not fix the problem even though logging out does.