Hi Chad -
I'm on Firefox 3.5.5 and 0.9.0 of your addon, and I too am having the issue with the loading calls. It will say "loading calls..." and then disappear, but if I hover over the area where I think it is on the status bar, it sometimes says something timed out, other times it gives me an update on the last call/text I placed, but in NO case will it make phone numbers "clickable" in the browser. When a number is hovered over, it will say "Call NNN-NNN-NNNN" but will not actually do so. But this is the first time the text of the addon in the status bar actually vanishes, only to be seen when it occasionally tries to refresh with Google. I've tried disabling/enabling, thru your addon as well as restarting it thru Firefox, to no avail? Google make some changes?