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i had an update of the firefox browser and i cant find a way to undo it, these colours hurt my eyes and i find it hard to read.(being colour blind) so i seek to undo it and go back to how i had it before which i like and prefer . can someone tell me how to get rid this change in my browser please

i had an update of the firefox browser and i cant find a way to undo it, these colours hurt my eyes and i find it hard to read.(being colour blind) so i seek to undo it and go back to how i had it before which i like and prefer . can someone tell me how to get rid this change in my browser please

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If you don't want to use Colorways, you can simply return to your previously used theme by going to Settings -> Add-ons and themes and selecting your old theme on the Themes page.