Same problem others have reported. It no longer works properly in Firefox. I figured out a work-around: If you click the 1-Password add-on and it doesn't work, then turn it off through Manage Extensions (no need to uninstall). Then close Firefox. Re-open Firefox, and turn the 1-Password add-on back on (through Manage Extensions). Then it will work fine until you restart Firefox again. Hopefully they will get this resolved soon...