install for Firefox 3.6 Rated 5 out of 5 stars
This will work for Firefox 3.6. To install:
1) save old .xpi at https://addons.mozilla.org/en-US/firefox/downloads/latest/3907/addon-3907-latest.xpi?src=addondetail
2) change extension to .zip and open it in Winzip.
3) edit install.rdf and change :3.5.*" to "3.*.*" and resave into Winzip. If notepad is set for your default viewer then just double-clicking the file, making the changes, and saving from notepad will allow Winzip to pick up your change.
4) save the .zip and rename back to .xpi.
5) drag the .xpi into an open Firefox webpage.