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reset about:config

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how do i reset about:config because some userchromes told me to change them but i dont use them anymore and dont remember which ones it were so i want to reset it

how do i reset about:config because some userchromes told me to change them but i dont use them anymore and dont remember which ones it were so i want to reset it

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no that only helps me reset some not all at once

Do you just change a preference in respect of userChrome?

You might just need to reset:

toolkit.legacyUserProfileCustomizations.stylesheets

no i changed a lot but dont remmeber which

You can remove prefs.js in the Firefox profile folder with Firefox closed. If you have extensions installed then you may want to keep a copy of extensions.webextensions.uuids and restore this pref afterward as the UUIDs are used to link the extension to its storage (indexedDB).

You can use the button in "Help -> More Troubleshooting Information" (about:support) to go to the current Firefox profile folder or use the about:profiles page (Root directory).