I have a Mac, and recently upgraded to the new version of Firefox this morning. After updating the version, I noticed a weird background image behind the tabs that is black with some weird imagery on it. I have no clue what the image is, and I cannot figure out how to get rid of it. I use a Windows PC with Firefox and this is not happening on it because the formats are set up differently. I have a screen shot of the problem. I just don't like the way it looks and I especially don't like it when one of the tabs goes transparent because then I cannot read what the tab says because of the black background. I just want to make the tabs background the same as the background I have from the Personas. I have even tried updating Personas and it doesn't do anything.