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I am prevented from downloading an important document because the site says that I need to disable an ad blocker. I am not aware of having an ad blocker and nothing shows up in add-ons and extensions. How do I find and disable an ad blocker that I cannot find?

I am prevented from downloading an important document because the site says that I need to disable an ad blocker. I am not aware of having an ad blocker and nothing shows up in add-ons and extensions. How do I find and disable an ad blocker that I cannot find?

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