Pre-existing non-Firefox code stripped? Rated 4 out of 5 stars

It could be that I missed a setting somewhere, but when this updates CSS, any references to non-Firefox code are stripped from the file. In fact, it looks like the entire code for any particular element/selector that is modified with this plugin completely overwrites what was previously there. The issue is that for those of us who code with -webkit and CSS3 standardized (hopefully) code, end up losing all of the code not recognized (rendered) by Firefox. If I'm missing something in configurtion, please let me know. If this issue can be addressed, this would indeed be a spectacular plugin.

Thanks!

This review is for a previous version of the add-on (0.8.2).