Like many others, I have to give this one star now - in the past it was definitely 5 stars!! Now only the tab I'm looking at is colored - all the othres are "transparent" so that I have to click on each one to be able to read the tab. The theme at the top doesn't show through anymore. I know many of the problems are related to changes in FF - hopefully the author of this extension can make the needed changes & get CT back to the superior add-on that it used to be. Lots of us are hopeful!! I was even going to donate, but I wish I could enter the amount I would like to donate, but there are only set amounts that I can choose. Change this & I'll send a few bucks when this is fixed & I'll give a 5 star rating too! When will I learn NOT to update FF??? I held out for months without updating & FF was running SO slow I finally told myself I had to do it. I thought I was updating to 56 but instead I got 57 Quantum & I think that's why so many issues. (It is faster, though....)