Not a bug after all, something in my profile was corrupting it.
** Changed in: firefox (Ubuntu)
Status: New => Invalid
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Back/Forward buttons stay insensitive, right click gives history
https://bugs.launchpad.net/bugs/571236
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** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/45967578/Dependencies.txt
** Attachment added: "ExtensionSummary.txt"
http://launchpadlibrarian.net/45967579/ExtensionSummary.txt
** Attachment added: "profile_default_pluginreg.dat.txt"
http://launchpadlibrarian.net/
