The height of the Firefox addon popup menu is different in height depending on how/when you click on the Bitwarden icon to open the menu.
The popup menu should always be the same size.
The popup menu is sometimes smaller then expected. It shows less information and makes working with it (especially when editing items) a bit more difficult.
The "wrong" height: https://i.ibb.co/hsGbShX/bitwarden.jpg
Screen recording of the issue: https://i.ibb.co/dsvnZhh/bw.gif
Other acive Firefox addons:
Ref: https://www.reddit.com/r/Bitwarden/comments/jnzw62/change_height_of_firefox_addon_popup/
I have exactly the same issue.
Browser: Firefox 84.0.1
Bitwarden Firefox addon: 1.47.1
I can also confirm this issue.
Other active Firefox extensions:
I managed to resolve this issue.
I have restored Firefox to default settings and after that the issue never occurred again.
I'm not sure if this helps anybody else but I guess it is worth a try.
In my humble opinion it is not a solution to reset to default settings. I would not even call it a workaround. As a Firefox user I should be able to run it with my preferred settings, wether it is in extensions or Firefox itself. It would be a shame having to nuke all settings just to resolve this issue.
I do however acknowledge that some advanced settings might be conflicting with the Bitwarden extension. Hence I did some investigation on my system.
I found that the setting privacy.resistFingerprinting = true causes this behaviour. According to privacytools this should be set to true to achieve better online privacy. Setting this to the default of false resolved the issue for me.
It is not totally unlikely that the extension Privacy Settings (that OP uses) modifies this advanced setting or some other setting which causes this behaviour of Bitwarden extension in Firefox.
I can confirm that privacy.resistFingerprinting causes this issue.
In my humble opinion it is not a solution to reset to default settings. I would not even call it a workaround. As a Firefox user I should be able to run it with my preferred settings, wether it is in extensions or Firefox itself. It would be a shame having to nuke all settings just to resolve this issue.
After I restored Firefox to default settings I synced the settings using Firefox account, but I didn't know it does not sync the custom changes made in about:config, my bad.
I found that the setting privacy.resistFingerprinting =
truecauses this behaviour. According to privacytools this should be set totrueto achieve better online privacy. Setting this to the default offalseresolved the issue for me.It is not totally unlikely that the extension Privacy Settings (that OP uses) modifies this advanced setting or some other setting which causes this behaviour of Bitwarden extension in Firefox.
Great find and yes, I do have that option enabled through that extension:

Resist fingerprinting was the issue for me.
Most helpful comment
In my humble opinion it is not a solution to reset to default settings. I would not even call it a workaround. As a Firefox user I should be able to run it with my preferred settings, wether it is in extensions or Firefox itself. It would be a shame having to nuke all settings just to resolve this issue.
I do however acknowledge that some advanced settings might be conflicting with the Bitwarden extension. Hence I did some investigation on my system.
I found that the setting privacy.resistFingerprinting =
truecauses this behaviour. According to privacytools this should be set totrueto achieve better online privacy. Setting this to the default offalseresolved the issue for me.It is not totally unlikely that the extension Privacy Settings (that OP uses) modifies this advanced setting or some other setting which causes this behaviour of Bitwarden extension in Firefox.