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SOLVED Keyboard shortcuts in Firefox don't work as expected

SOLVED: The Firefox extension "FoxTab 1.4.5" was responsible for breaking these shortcuts. Disabling it restores the desired functionality.

Previously, on Ubuntu and other systems, the following shortcuts in Firefox would work:

  • Ctrl + Tab - Switches between tabs
  • Ctrl + F4 - Closes current tab

Since installing the Mate desktop (Gnome 2), the shortcuts do the following:

  • Ctrl + Tab - Does nothing
  • Ctrl + F4 - Closes Firefox

I've checked in the "Keyboard Shortcuts" section in Mate, but neither of these are being overridden. Compiz isn't installed.

This is rather annoying.