Firefox extension vanishes when trying to input master password


I’m using the latest (June 5th) Bitwarden Firefox extension on Firefox 60.0.2 (64-bit) on Ubuntu 18.04 (all latest updates as of Jun 13th). Whenever I open the extension to input my master password, it vanishes immediately. The only way to log in is to conjure up the “left bar” and enter the password there. If I log out from the extension, I can get the log in window of the extension, but as soon as I focus the master password field the window vanishes again.

It used to work in this Linux installation before I moved this installation from a desktop machine into a laptop with two display setup and nVidia drivers instead of nouveau, if that makes a difference.

I’ve tried to un/reinstall the extension etc., but it just keeps vanishing on me.

How can I fix this?

Duplicate Issue with Firefox extension

I can confirm that this behavior does not occur with the Bitwarden extension in the MS Edge browser.