where is userContent.css?
Hi, I want to use dark background color theme in the Mozilla Firefox PDF viewer, read here https://support.mozilla.org/en-US/questions/1434510 but cannot find "userContent.css". My question is where can I find this file on a Windows 7 or Windows 10 installation?
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You have to create it.
Go to about:support. Look down the blue block on the left of the screen that will open until you come to Profile Directory. Click the Open Directory button next to it. This will open your Profile Directory in Windows Explorer.
Make a directory/folder in that called chrome, all lower case. In that, ie the directory you've just created, put your userContent.css file.
If you haven't already you need to go to about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to true for your changes to work.