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accidently said yes to pop up and can't get rid of it

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A pop up was blocked while I was playing koc, I accidently hit allow pop up and now can not get rid of it

A pop up was blocked while I was playing koc, I accidently hit allow pop up and now can not get rid of it

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You can review and revoke pop-up permissions here:

orange Firefox button or Tools menu > Options > Content

Try the first Exceptions button on the right, the one across from "Block pop-up windows"

Does it work?