Calm Colors от Marek Jedliński

Firefox/Chrome extension: tone down web page colors for comfort and readability.

Unreadable text on a page? Unpleasant color scheme? Not enough contrast? Garish colors hurt your eyes? This extension will apply a lightweight, pastel style to aweb page, to make browsing more comfortable.

Four different, pleasant themes are available: browser default, light, sepia and dark.

To apply a theme, right-click a page, select "Calm Colors". then select a theme.
To remove a theme: right-click a page, select "Calm Colors". then select "No Theme". (Or reload the page in the browser.)