Red letter "A" appears in the top left

I got this red letter 'A' in the top left corner in some Web sites. No idea what it is and I want to get rid of once and for all. I hope someone can help. Thank you!

You can list the installed extensions?

If it works in Mode safe mode and normal mode with all extensions (Firefox, Tools/menu key > Modules > Extensions) off and then try to find which extension is the cause by allowing an extension at a time until the problem reappears.

Close and restart Firefox after each change via * button '3-bar' menu > exit (Power button)

  • Windows: File > Exit
  • Mac: Firefox > quit Firefox
  • Linux: File > exit

Tags: Firefox

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