The greatest extension in terms of theme(s) creation at the most humanistic end-user level.

Also if it's possible can you make every possible piece of the browser color palate customizable? For example you label "Tool Bar Icons and Text" can you further break it down where for example one arrow key is one color, and the other a different. Or both arrow keys the same color, but then the drop down menu a different color. Also if you can make it mobile friendly, considering the market is now mobile. I would greatly appreciate it.

Basically what I'm getting at is I love how easy you've made it but I wonder if it can be even easier in terms of more selection. The same way you guys designed the "Customize..." droplet that allows you to put what you want on your GUI bar for quick link access. In regards to individual paint, because honestly it's so cool what you can do with such a simple template.

I feel that will bring a lot more end users if they can completely customize the coloring. People love cosmetics, and even further implement moving images, etc.

I hate the fact that personalized images feature only covers half of the space rather all the space like good ol' personas and themes. Until further personalization in that regard (and a myriad of other details), I'm not changing score.

Simplification is fine: but not at the cost of features and potential, specially for something that is supposed to be all for personalization.

Such a huge and depressing step backwards from Personas.
The tiny array of options it allows all work perfectly, and while it is probably far simpler to use that Personas for creating a theme, you could equally argue that MS-Paint is simpler to use than Photoshop - that doesn't make something fit for purpose.

I can not register my theme online because I put a personal image; complicated because I have to remove the extension and put it back on and I have to start all over again.

Would be great as I easily created my own custom theme (Spider-Gwen) but now my last created settings in Firefox Color are set as my theme every time Firefox fully initializes after closing overriding my current theme selection, which I then have to go into the settings to deactivate my theme, then reactivate it to overwrite what Firefox now thinks is my default theme from Firefox Color.

The add-on offers very comprehensive customization, as far as controlling colours of things goes. However, throughout my usage I've noticed two flaws:
1. The default about:newtab page colour is forced to a white background with any theme. If the add-on is going to change it, then that should be part of the customization.
2. Clicking the add-on icon will automatically turn on a theme. The add-on shouldn't do this, instead doing nothing until a user saves the theme.