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how do I unblock Block site blacklist?

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I accidentally put this on and cannot take it off. A notice appears on the bottom right saying www crossed out and the site is block site blacklist (or not on whitelist) How do I fix this?

I accidentally put this on and cannot take it off. A notice appears on the bottom right saying www crossed out and the site is block site blacklist (or not on whitelist) How do I fix this?

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Firefox doesn't have any sort of built-in site blocklist. You'll have to open the Add-ons Manager, Extensions category and configure the options for whatever extension you're using that adds this feature.

If you don't know which one it is, type about:support into the address bar and press Enter. Copy the Extensions section to the clipboard, then paste it in a reply here.