This is a hack of the Imageshack rightclick upload add-on to make it work with Firefox 3. The automatic updating no longer works, but everything else does.
You cannot install from here. Right-click the link and select “save as,” then drag the link onto your firefox browser window.
Imageshack Right-click for Firefox 3.
Changes from the original: removed the update tag in the .RDF file, increased the version number in the .RDF file. That’s it.