When I press Ctrl - . to unlock 1Password X, keyboard input does not move to the 1Password X window so I can immediately input my Master Password. I have to manually click in the window. Sometimes I forget, and type my Master Password into the login window that prompted me to launch 1Password X, which is naturally a big problem!
After further investigation - this only happens when 1Password is removed from the Firefox toolbar and placed in the 'overflow' menu. It also causes the 1Password window to conform to the size of the Firefox pop-up menu, which looks awful and reduces functionality.
I'm happy to move the app back into the toolbar, but it is not obvious that moving it will cause problems (doesn't happen in Safari for macOS IIRC). Not sure if this is a Firefox bug or a 1Password X bug, but it's a weird one.
1Password Version: Not Provided
Extension Version: 1.15.3
OS Version: Windows 10 1703
Sync Type: 1Password.com