Now that Firefox 3.0 Release Candidates are starting to become available, we have made modifications to AMO to accept the production version numbers for Firefox 3. In particular, we have added “3.0″ and “3.0.*” as valid Firefox compatible versions. The full application compatibility list is available here.

What this means for you as an add-on author is that after you test with the Firefox 3 release candidates, you can use the Developer Tools section on AMO to bump your version number without having to upload a new version of your add-on.