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Things possible in Firefox 57+ (by using CSS code in userChrome.css/userContent.css) #1
As long as userChrome.css and userContent.css are supported by Firefox, Photon UI content can be modified using CSS tweaks, but CSS code can not create entirely new items, buttons or toolbars.
Most CSS code is copy/pasted from already available 'Classic Theme Restorer' and 'Classic Toolbar Buttons' add-on code.
Promo screenshots (Win7s AeroBlue colors are possible on other OSs too)
Tested / confirmed working in userChrome.css/userContent.css (at the moment)
Already in Firefox 57+ without installing WebExtensions (compared to Firefox 56 or older)
Things possible by installing WebExtensions
Not properly working using CSS tweaks
referenced this issue
Oct 6, 2017
Nice! I got my 'old' firefox layout back. Still need to configure some/many things though.
Thanks for this chrome css!
edit: issue no.3 is fixed in v. 1.0.2
The mentioned list was mostly about what of CTRs features are still possible in Fx57+, so it obviously does not include any exotic tweaks.
Colorize URL bar in private tabs
Move tabs to bottom of window