Ok good idea it was being caused by the Image Zoom 0.3 plugin. I
disabled that and now the problem appears to be gone. It looks like it
has already been reported at https://addons.mozilla.org/en-
US/firefox/addon/139 so I will close this bug.
Thanks for looking into it!
** Changed in: firefox (Ubuntu)
Status: Incomplete => Invalid
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dueling popup menus on some sites
https://bugs.launchpad.net/bugs/177574
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