Small and - as far as I can tell - does exactly what it says on the tin. Middle button menu popup (not exactly intuitive btw, might want to feature a more prominent reminder on the page) includes an option to exclude the current site. The sliders are useful if you want to mess with the tint.

Can't really ask for more imo. This is a pretty good add-on for if you simply want to dim your pages but not re-theme them, especially since some of those end up giving you funky replacement colours. This avoids that problem while also dealing with the whole "argh my eyes" issue when you open a site that stupidly throws up huge chunks of unused whitespace at you.

5/5, recommended.