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.

GARBAGE! What could Mozilla possibly be thinking?? Set-up is a pain, unless you choose to use one of the "pre-designed" themes that's offered. Trying to get text to display correctly in the search bar, bookmark bar, or side bar is often hit or miss. Most annoying of all though is that if you do find a "theme" that you can TOLERATE, Firefox sync does NOT install it to all of your computers automatically, leaving one to have to do this on EVERY SINGLE MACHINE individually! I'll allow two stars because Firefox is still my browser of choice on my Linux computers, but as far as theming is concerned, Mozilla has taken a HUGE step backwards!!

Хорошее расширение. Было бы неплохо добавить возможность менять цвет фона и текста в боковой панели.

Good addon. It would be nice to add the ability to change the color of the background and text in the sidebar.

I've spent a lot of wasted time trying to get Firefox Color to make Firefox look OK, but I am still not happy with it. It's a shame that Personas Plus is retiring and being replaced by this silly addon.

It's good for changing the color easily, if you don't want to use theme. But I prefer themes (not only because themes have images). I'm afraid this experiment will replace themes in the future. When you vote for this extension, be aware Firefox already has this idea in mind.

The best tool for theming Firefox.

Works well for me. I understand it works online. Takes a second until it uploads my own colors. Good I can add and save my own themes in the custom backgrounds option and can get it back with one click without having to disable Firefox Color. It saves my colors and own themes online, so the share option makes it possible to transfer it to any of my other PC.

Thank you guys, nice job. Experimental but works well. Keep up the good work. I like it.

It's a good idea but it doesn't work well along with themes. It's one or the other. I found it quite limited then. Therefore, I'm back to my usual themes...

this one is perfect. Just please let the user go back to their original theme without having to disable the addon.

Thank you for Firefox Color, my family and coworkers truly love every aspect of this feature. I can see where it would end up replacing a lot of (creative/picky) users’ need for any other published-Firefox-themes. I have been waiting for something like this for forever, to (perfectly) match my overall OS theming - finally. Bravo!

I've changed my review to two stars because Personas Plus is going out of support in six days and this add-on is still very experimental. I need it to be much more user friendly, starting with allowing 10 MB JPG images from my Panasonic LUMIX.

Fantastic tool :) Finally I can change everything.in chrome.css, not everything was possible.Please continue the work, thank you.
edit :Please add sidebar change color background and text, and will be perfect.