We do have some more significant changes in the pipeline but we feel we can't wait for them to be finished before we release a version that supports the latest and greatest version of Firefox, which many users are switching over to already.
Inconveniently, we had to make a significant change to how the Clueviewer is positioned in Firefox in order for it to work properly in Firefox 3.6, so we would appreciate people having a bit of a play and making sure it's working correctly for them before we release this to the public. Various ways to let us know about your experience are listed on our contact page. Thanks for your help!