Hello !
Thanks for writing --
List-it now works with Firefox up through Aurora (10.0a) - that means
that FF 8 should work fine!
Please make sure you have updated to the latest version --
You can go to Add ons -> Check for Updates, or, alternatively, simply
go to
http://welist.it
and click on "Install list-it for Firefox"
Please let us know if you encounter any problems or difficulties,
Yours,
Max for the list-it team