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I'm using Stylish addon for Firefox with a default dark css. I also have changed the default Window colors in Windows registry. This has changed the about:blank page's color to a dark one. But when I open a link on a new tab, before the page loads, Firefox is showing a blank page with white background. I wonder how can I change this white color to a different one.

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Create a folder named "Chrome" in this location: C:\Users\[user]\AppData\Roaming\Mozilla\Firefox\Profiles\[profile]\chrome

and created an empty userChrome.css file with this line:

browser { background-color: #373739 !important; }

It worked fine for me.

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