EPILEPSY WARNING YOU HAVE BEEN WARNED MY FRIEND. *2.0.1 FIXES THE FUNCTIONALLITY PROBLEM
UPDATE 2.0.0 MASSIVE OVERHAUL! * 2.0.1 fixed the functionality bug
It's what you've been waiting for. Themed colors. They're here and working fantastically. In the future I'm going to add the ability to create your own custom selection of colors, but that's the future. Next update, maybe.
I've also added an advanced feature which currently lets you change what inputs trigger the color/random/both.
While the massive overhaul may not be that noticeable to those who have used this extension in its last state, it mostly relates to me completely rewriting the extension because I had wrote it in a horrible way at first and it was almost impossible to update it because it was so unorganized.
Once the extension is loaded, a little smiley face should pop up in the corner of your browser. This is the RAINBOW extension. The first time you load it up it might take a bit for the checkboxes to work but eventually everything should be fine.