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Strange popup

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After downloading Firefox on my other computer this strange popup started appearing. I have uninstalled Firefox on that computer but the popup remains. How do I get rid of it?

After downloading Firefox on my other computer this strange popup started appearing. I have uninstalled Firefox on that computer but the popup remains. How do I get rid of it?
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You can check some of the options here to help remove malware from your computer -

Troubleshoot Firefox issues caused by malware https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

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Note that you should never click on such a pop-up, but try to close the tab. See also the about:unloads page.