Make sure you remove "extensions.rdf" (it must exist under your firefox profile directory):
$ find ~/.mozilla/firefox -follow -name extensions.rdf -- "installLocation has no properties" error in nsExtensionManager.js during install/update of extensions https://launchpad.net/bugs/65609 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
