getfirebug.com has Firebug 1.6b4. Patches for 31 issues have been ported from Firebug 1.7 and all tests pass. The plan is to wait for your feedback and if no blocking bug is reported we’ll release Firebug 1.6 final on AMO.
We are also planning to release next betas on AMO (using the beta channel) in order to reach more beta testers.
Please post feedback in the newsgroup.