Open Firefox customization panel and move the new tab button to headerbar.
Be happy with your new vibrant Firefox.
Uninstalling
Go to your firefox profile folder. (Go to about:support in Firefox > Application Basics > Profile Directory > Open Directory)
Remove the chrome folder.
Enabling optional features
Open chrome/firefox-sweet-theme/userChrome.css with a text editor and follow instructions to enable extra features. Keep in mind this file might change in future versions and your configuration will be lost. You can copy the @imports you want to enable to a new file named customChrome.css directly in your chrome/firefox-sweet-theme directory if you want it to survive updates. Remember all @imports must be at the top of the file, before other statements.
Alternatively you can run installation script with -g flag to auto install GNOMISH features.
./scripts/install.sh -g
Those features are not included by default, because can introduce bugs or Firefox functionalities lost.
hide-single-tab.cssGNOMISH
Hide the tab bar when only one tab is open.
You should move the new tab button somewhere else for this to work, because by default it is on the tab bar too.
matching-autocomplete-width.cssGNOMISH
Limit the URL bar's autocompletion popup's width to the URL bar's width.
system-icons.css
Use system theme icons instead of Adwaita icons included by theme.
symbolic-tab-icons.css
Make all tab icons look kinda like symbolic icons.
Icons might appear black where they should be white on some systems. I have no idea why, but you can adjust them directly in the system-icons.css file, look for --gnome-icons-hack-filter & --gnome-window-icons-hack-filter vars and play with css filters.
Development
If you wanna mess around the styles and change something, you might find these
things useful.
To use the Inspector to debug the UI, open the developer tools (F12) on any
page, go to options, check both of those:
Enable browser chrome and add-on debugging toolboxes
Enable remote debugging
Now you can close those tools and press Ctrl+Alt+Shift+I to Inspect the browser
UI.
Also you can inspect any GTK3 application, for example type this into a terminal
and it will run Epiphany with the GTK Inspector, so you can check the CSS styles
of its elements too.
GTK_DEBUG=interactive epiphany
Feel free to use any parts of my code to develop your own themes, I don't force
any specific license on your code.
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