This extension works like Mac's Expose feature, except that it concentrates on showing a thumbnail overview of all of one's tabs (which can then be clicked on to choose a particular tab).

Inserting the following right before "</overlay>" in the file "xpose.xul" in the "/extensions/" directory will allow one to invoke this helpful extension via a key command (here as shift, ctrl (command/apple key on Mac), and X) rather than needing to rely on clicking the small icon.

<keyset id="mainKeyset">
   <key id="my-key"
      oncommand="Viamatic.Xpose.Main();" />

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