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Firefox is preventing me from sending and opening files.

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I am working in a federal government website. I try to upload files or open files. I get a message that Firefox is preventing me from opening popups.

I am working in a federal government website. I try to upload files or open files. I get a message that Firefox is preventing me from opening popups.

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https://support.mozilla.com/en-US/kb/Pop-up%20blocker#w_pop-up-blocker-settings

Is that website in the Allowed Pop-ups window with an Exception to Allow?

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Where do I find the Allowed Pop-ups window?

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You should see a pop-up block icon on the right end of the location (address) bar if pop-ups are blocked.