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This extension is the perfect solution for editing and saving the edited CSS styles of any visited webpage. It is easy to use. It allows to edit styles with help of forms or manually edit the CSS code. And after that, the rules are saved and applied to the edited webpage each time it is loaded.

Need better instructions, maybe a video? Is not wanting to work, but idk for real if it's me doing nonsence

Great™ — This has worked really well for me for years now, and it continues to be improved. There are few things more empowering than editing websites beyond what the original designers intended. Thank you!