Rated 4 out of 5 stars
This add-on is usefully for me by blocking bright backgrounds for my sensitive eyes. Being able to adjust the percentage works as well. Slightly confused as there was a problem with my version of 0.5 Reviews suggested there was an upgrade but could only find version 0.4 on Firefox pages. However 0.4 works so far and my problem has gone.This review is for a previous version of the add-on (0.4.1-signed).
The new version of the add-on is here: