I'm trying to change the colour of one or more tabs (not necessarily the one that is currently selected). It need to be at least the bit where the tab title is displayed, not sure how it's called.
The Pre-Quantum Firefox addons don't work any more, is there any other way to do it? The colour does not need to persistent be between sessions. By the way the goal in the end is to visibly group contiguous tabs. I want it to be easy to differentiate between the tab groups (I'm already using tree style etc. but I want the distinction in the tab bar as well).