My own CSS config for a dark firefox theme, slightly based on plata GTK. Thought i could share it :)
Firefox won't accept the dark colors from this theme unless we are using its dark theme.
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Navigate to about:config in the address bar and accept the risks.
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Search for toolkit.legacyUserProfileCustomizations.stylesheets and toggle it to true (by double clicking on it).
Either of the following two methods work:
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Using the Firefox troubleshooting page
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Click on ☰ ➝ Help ➝ Troubleshooting Information or navigate to about:support in your address bar
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Under Application Basics, click on the the Open Folder button. You should now see your profile folder.
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Create a new folder called chrome.
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Copy the files userChrome.css and usercontent.css inside that folder.