You could manually download the extension (the .xpi file)and hack it (edit the install.rdf) to work with firefox 3
An Example of what to look for to edit
Code:
<!-- FireFox -->
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>1.5</em:minVersion>
<em:maxVersion>2.0.*</em:maxVersion>
</Description>
</em:targetApplication>
Replace 2.0.* with 3.0.* save and then manually install and it will work in most cases with firefox3
All you need to edit the .rdf is gedit and the archive manager fileroller.
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