Firefox/Feature Brainstorming:User Interface: Difference between revisions

I use a different Firefox window to each of my areas of work. This groups my research and activities. In one window, all tabs relate to a certain project; on another window, all tabs relate to a specific research; on another, my personal interests, and so on. It would be good to be able to differentiate them somehow --colors, maybe-- organizing and grouping our browser tabs like folders group files. The goal is to make each window easily recognizable as focused on that task, project or area.