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Those people who recently upgraded their Firefox browser to version3.5 would find very difficult with the fact that it’s incompatibility with Google Gears or Offline support. But you can download unofficial Google Gears addon from the following links to enjoy the offline support.
Linux i386: http://gkovacs.xvm.mit.edu/google-gears/gears-linux-0.5.25.0.xpi
Linux x86_64: http://gkovacs.xvm.mit.edu/google-gears/gears-linux-x86_64-0.5.25.0.xpi