This add-on deserves minus stars. As other users state, you can't restore your old theme. This add-on is an absolute RUBBISH!

unable to add transparency to almost all items. this limits your custom imagery to a very limited area, minimizing the entire point of the exercize.

Functionally unusable if you just want to tweak the colors of the standard theme. If I change the color if a single thing, it changes the colors of everything to the stupid theme the add-on starts off with.

I had a custom theme saved & it still shows that it's there, but it won't actually allow it to be put on my screen. I HATE the preset ones as I can't see them well at all & some literally make me physically ill. I NEED to be able to keep the one that I have had for a long time that suddenly disappeared.

元に戻すにはどうすればいいのだ？

No option for old Firefox colors. Photon isn't it. I HAD designed my own and saved it - TWICE and Firefox took it down and reverted to gray again. IF IT AIN'T BROKE DON'T FIX IT. You could distinguish firefox from other browsers before, but not now. And the old designe isn't there. Again, Photon isn't it.

can't save custom backgrounds and have them synced across multiple devices. so dumb

Where do I find saved color sets? I see saved sets after only aafter I make changes & click save icon. But, if I come back later, I can find neither a tab/button, nor any info on how to save/retrieve them, except for exporting.

我喜欢

This is, as far as I can tell, completely useless. Managed to get it to display a custom image, eventually and more by fluke than anything. The tab for the saved "themes" is hidden by the text box on smaller screens so didn't even find it until by chance looking on another computer. The main reason I wanted to customise the theme was so I could distinguish between personal/work profiles, but the "theme" doesn't sync when using Firefox Sync so this is not only unusable but also useless. Do not see the point of this add-on.
Also, minor annoyance, from the settings page there is a link that has been localised to say "Firefox Colour" but it is still called "Firefox Color" everywhere else. Pointless localisation there, either do it everywhere or nowhere.

Causes conflicts with Firefox's themes. Only use one or the other.

I just wanted to change my top bar colour to blue and it's so complicated? Other colours randomly changed on other UI elements that I didn't ask for? Could you have made this any more baffling?
I was also turned off by Firefox marketing associating "blue" with "activist". Yeh no thanks pal, I just like the colour, save me the cod psychology...

I just wanted to change my top bar color to purple and it's so complicated to do. I have to recreate the whole default theme from scratch and then tweak the purple. When I got to a result I liked I saved the preset. After a while I wanted to change the shade a little bit. I did so but I was not satisfied, and by mistake I clicked reset all, instead of Back. At that point I was screwed, had no idea where to find the saved themes, would have had to recreate the original theme once again so I gave up, uninstalled the extension and came here to write this review. Work on your UX because this is really awful.

Upgrading changes my background color scheme without permission. This has happened twice in the past 6 months.

no funciona

it works but sometimes it glitches and erases all the themes i have made, idk if it's just me or if this add-on is doing it

Nothing speacial. I just find good theme for myself and add it "Fankots Theme by Fantron".

The colors are nice to costumize. Unfortunately UNUSABLE because after opening Firefox it takes an additional 2 Minutes loading the theme before you can start doing anything.
How on earth can you design an addon JUST for some colors consuming SO MUCH ressources??? I really have to control my anger here. Unbelievable.

NO ME DEJA USAR LO QUE YO CREO , QUIERO FONDO GRIS !!!!, PORQUE NO HAY UN FONDO GRIS???,,,O ES BLANCO O ES NEGRO UNA PORQUERIA..!!!! ESTOY PODRIDO!!!