Firefox menus won't open

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https://bbs.archlinux.org – Hi all,I'm having an annoying problem with Firefox.  I tried asking on their support forums, but they suggested I check with my distro.Firefox has been working fine for years, but recently (some time in the last couple of weeks) the menus stopped working.  Clicking on "File", "Edit", etc. does nothing.  Right-clicking in the page does nothing.  Clicking on a folder in the bookmark toolbar makes the border change as if it's a button being clicked, but no menu ever appears.Has anyone else experienced this?Today, on a different Arch machine, I tes (HowTos)