A Firefox extension that customizes energy-saving color schemes for CRT monitors.
One important thing to note is that the extension will not affect TFT monitors, so keep that in mind before installation. Additionally, the concept behind the extension is based on the fact that a white pixel uses just as much energy as a black dot on a sheet of paper uses ink from a pen. Thus, inverting the usage of white and black colors on a webpage can lead to energy savings.
With BYM, a typical webpage's black text over a white background will be displayed as white text over a black background when the extension is ON. This simple mechanism can lead to a little bit of energy savings for CRT monitor users. Overall, I highly recommend giving BYM a try!