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overriding or editing specific files in chrome://

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I'm trying to change Firefox Reader's default css without using an addon. I've found the css files in chrome://global/skin/aboutReaderContent.css. Is there a way for me to replace or edit these css files?

I'm trying to change Firefox Reader's default css without using an addon. I've found the css files in chrome://global/skin/aboutReaderContent.css. Is there a way for me to replace or edit these css files?