Hi

Thank you for your question and thank you for using a pre-Release version of Firefox - this really helps Mozilla make future versions of Firefox even better.

With Chatzilla being an add-on, I would recommend that you seek support for this issue form the add-on developer. Add-ons for Firefox are developed by a large community of independent developers, the one that developed his add-on can be found on the page that you downloaded the add-on from.

Hmm I see you are Testing the Aurora aka developers edition builds in which it like Nightly channel gets checkins almost everyday and therefore gets a update each of those days. This can sometimes cause issues until fixed, finished, or reverted.

You could ask in the #chatzilla channel in irc.mozilla.org https://wiki.mozilla.org/IRC