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Can’t install anymore extensions in Firefox 3? Kill extensions.rdf

I’ve been trying out Firefox 3 and one strategy I do is to copy my Mozilla Firefox folder with me to whatever machine I go to so I don’t have to reinstall plugins, re-enter all my passwords, and configure everything about Firefox until I’m happy.

However, it seems due to some reason or another I lost the ability to install extensions. After Googling around I dug up a nice hint on Ubuntu’s Launchpad site.

Basically delete the file named extensions.rdf in your Mozilla directory

  • Windows: C:\Documents And Settings\[Username]\Application Data\Mozilla Firefox\
  • Linux (Fedora 9 and Ubuntu 7.10): $HOME/.mozilla/firefox/profile/MY_PROFILE/

Read the Ubuntu fix

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