Firefox 29, the next version as of this writing, will bring with it a brand new interface called Australis. This interface is changing loads of toolbar structure, which may negatively impact Googlebar Lite.
I'm posting this warning ahead of time to let you know that I will definitely work towards making Googlebar Lite compatible with this new theme. However, doing so will take some time and effort. As such, don't be surprised if support for this new theme isn't immediately available. I may have to bump the minVersion of whatever new version I release to 29.0, in order to prevent breakage in older browsers.
Until I set up a development sandbox with the latest build, I won't know how bad the breakage will be. Until then, please be forewarned that there's some turbulence ahead.