This would be 5-star in all respects, except for the following. I really hope the developer will listen.

1) Please let the user define which color parameters to use. In other words, if I only want to change the text color, allow me to ignore (turn off) the background and link color.

2) I don't understand why the add-on says "Gray" where the screenshots show "saturation" level.

3) In nested CSS division tags, where the website is pulling text content from the the embedded division tag, the text color will not change.

4) Keeping it simple is good, but it would be nice if the user could plug in a color value, either hex or decimal, and forgo the color wheel, which does not show the color values.

Outside of that, I would recommend the add-on.