If you a are linux user, you are probably affected by this.
after upgrading to the latest version of firefox, you might find that if you login as a user, you can’t use the web search toolbar. This is annoying because the search facility is actually very handy.
Initially, I thought it was because of selinux… but as it turned out, it was user permission. changing your firefox config to your username simply fixed it.
sudo chown username:username -R ~/.mozilla/firefox
Some files used by the web search has root as the owner. The solution was simple but I couldn’t find anything in google yet.