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|User since||July 18, 2008|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Seems to work with FF3 Rated 5 out of 5 stars
This great extension seems to work with FF 3.0.1.
As Brett Zamir said, you have to modify file "install.rdf" in extension archive .xpi (it's a zip file), and change value of "em:maxVersion" with "3.0.1" instead of "3.0a1".