Excellent add-on. People with color perception issues can fine tune FF to their needs.

Thanks to this, it looks like hatsune miku! <333333

This is an awesome addition. It's so hard to find a specific colour theme I like, but now I can choose exactly the colours I want. Brilliant extension.

ruined my browsing experience, might have to go back to chrome because wtf is this??? don't know how to fix this glitch uninstalled app, uninstalled & reinstalled firefox...still the same

It's a great option - but too hard to find where to make changes to it!