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each time i open firefox, a small rectangle add appears with firefox logo. How do I stop this annoying occurence?

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this advertisement pops up each time i open my Firefox browser. How can I turn this off?

this advertisement pops up each time i open my Firefox browser. How can I turn this off?

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).


Do a malware check with some malware scanning programs.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.

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