Why can't I apply CSS to an element? I cannot do this either with the developer tools (Browser Toolbox) or by writing the desired settings in userChrome.css, yes in about:config the setting is activated.

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1 Answer 1


Tor Browser is a Firefox, but it's explicitly tuned for privacy, so - just like in your case - many ubiquitous features are discarded and filtered for the sake of fingerprinting prevention

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