This is what I added to Issue 975: Hope this helps.
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As far as I can tell there is no Gears version 0.5.33. The latest
version of Gears is
0.5.32 and there's no update available.
I'm running Ubuntu 9.10 with Firefox 3.5.6pre (currently) and was
seeing this same
problem. I had installed Gears by installing the 0.5.32 .xpi file via
the Gears
website. But for some reason, Gears 0.5.32 was also installed via the
Synaptic
package manager. This is a separate install from the .xpi file found
on the Gears
website and appeared to have been causing the problem. I removed Gears
via the
package manager and the problem disappeared. This *did not* remove the
Gears
extension from Firefox.
My guess is that a conflict was caused by the system attempting to
install Gears into
Firefox when the latest version was already installed via an
extension.
I don't know what other ditros use for a package manager but I would
suggest checking
to see if your version of Linux already has Gears installed as a
package and if so,
remove it and use the "official" .xpi version of the Gears website.
This way will
guarantee regular updates which you may not get via the repositories.
HTH