Any new tab opened in FF has this icon in bottom right corner.

Which extension is adding this icon ?

You didn't attach the Troubleshooting Information, so we can't check this.

• https://support.mozilla.org/en-US/kb/use-troubleshooting-information-page-fix-firefox
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

I provided EXACTLY what you wanted in the nearly EXACT same question! You wanted a "screenshot" I provided that as you requested in the "archived" thread.

What archived thread are you referring to ?

The one YOU posted about 3-5 years ago. I see that when I click on the saved link, it has been deleted. Neat trick! You replied to the poster and told him to "provide a screenshoot" of the tab with icon

We can't recognize that icon. Can you see it in a troubleshoot mode?

The icon is from AdBlocker, A FF ext/add on but I have a subscription per year... Don't know why "we" can recognize it. It is the Mozilla/FF logo as well as AdBlock

I believe the problem has been fixed. Testing now.... Has NOTHING to do with Troubleshooting listed. Rarely does anyway.