
Firefox: aging tabs
Aging Tabs is a useful extension to the Firefox browser that changes the color of tabs depending on their use:

“old” tabs (those that have not been opened for a long time) will be dark gray, active ones will be light. Very convenient for my surfing style with many tabs open simultaneously.

“old” tabs (those that have not been opened for a long time) will be dark gray, active ones will be light. Very convenient for my surfing style with many tabs open simultaneously.