How to prevent Firefox from leaking device theme. I cannot be the only one that likes Dark Mode on the O/S and on the Firefox browser, but not have websites "assume" I want it on their websites.. Dark Mode when executed and implemented well is a fantastic option to have. However, I dont need algorithms doing the thinking for me. I only want websites to read the smallest amount of information about my web browser and operating systems as they need to function. The IOT has far to much information about me then I would like. Websites "assuming" I want to view their website in Dark mode, because I have my O/S or Web browser in Dark mode is a disgrace. To all the extra smart people out there, I realise this is a continence for some people, if not most. I am a Firefox user. I am not "most" people. We're is the option to block this behaviour? Thank you.