When Firefox itself changed to some crazy looking theme-add-on, I serached for a new, and tried many. But this "Blue & White" is clean and calming (no disurbing element taking attention from the important stuff), it sits good on top of the screen - and works equally good whatever lightning in the room. Five stars from me! :) May try the same in green and purple later - but for now I'll stick to this! Recommended - thanks Geert for making it!