Rated 5 out of 5 stars

FF 16.0
Vista_32-Pro

Thank-U

PS ..

I always extract .xpi = Goto: folder and Change Install.rdf \max version =
to your FF version and save..
Then select all in folder \Send to zip\ copy name and change .zip extension back to .xpi file type.
Drag and drop to blank tab and let firefox do the rest...