Rated 5 out of 5 stars

Here's how to modify the xpi so that it will install in FF 3.5:

Manually download the extension by right-clicking and choose Save Link As to save the XPI file. Open it with 7-zip. Select the file named "install.rdf", right-click it and select "Edit". Find the line containing "em:maxVersion" and change the value from "3.0.*" to "3.5.*". Save the file back into the .xpi file (7-zip will ask you if you want to when you close the edit; click "yes"). Then open the .xpi in Firefox and install.

I suspect that the author has not bothered with this 'cos it's so easy to fix.

This review is for a previous version of the add-on (1.4.2).