Auto-lock on sleep (Firefox extension)

Hi there,

I don’t quite like the fact that if my Bitwarden Firefox extension is unlocked before I put my Macbook to sleep, it will remain unlocked when I wake my Macbook (i.e. I log into macOS) again.

Is this a bug or a feature? I’d hope that when I put my Macbook to sleep that the BW extension would also lock - like it does in e.g. 1Password.

Using Firefox 84.0.2 on macOS High Sierra.

I see that in Chrome (Mac) there is in fact a Vault Timeout option of “On System Lock” and it works, but why is this option not available in Firefox??