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I keep getting a pop up for favicon.ico; how do I prevent it?

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I keep getting a pop up for favicon.ico, asking if I want to open it or save it to file. The pop up shows in Firefox's regular download window. I do not click or pass my cursor over any buttons or ads. It happens quite often as of late, and is very annoying. How can I stop this?

I keep getting a pop up for favicon.ico, asking if I want to open it or save it to file. The pop up shows in Firefox's regular download window. I do not click or pass my cursor over any buttons or ads. It happens quite often as of late, and is very annoying. How can I stop this?

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

  • Don't make any changes on the Safe mode start window.

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")