It would be nice to have a clear visual difference between loaded and unloaded tabs, for instance another background color for unloaded tab as opposed to the light default background for loaded tabs in the case of the default theme. I would like to spot loaded tabs easily when I want to free memory by unloading tabs that I don't need at the moment. This means that graying out text for unloaded tabs wouldn't work well for me, since the difference to normal text isn't very eye-catching.