Here I have attached screenshots using FF31beta1 in Win7 with:
1. CT24.0
2. CT24.2
3. CT24.2 modded per post #16222*
I marked in each screenshot the Active Tab (1) and a Mouse Hover (2). The mouse pointer was masked from the capture, of course.
* - "in clrtabs.css, if I comment out from “.australis .tabbrowser-tab{…}” to the end, it goes back to how I liked it"