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many websites won't open unless I whitelist them from the ad blocker. I can't find an ad blocker in settings

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show me how to whitelist a site or disable the embedded ad blocker.

show me how to whitelist a site or disable the embedded ad blocker.

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The website probably wants you to disable Enhanced Tracking Protection. It's not an ad blocking feature per se, but some websites see it as one because it's blocking some tracking code that's used for displaying ads.

More information about whitelisting specific websites can be found in the What to do if a site seems broken section of the Enhanced Tracking Protection in Firefox for desktop page.

Hope this helps.