hello howardek, this might be caused by malicious addons and adware present on your system, so please perform all these steps:

1. reset firefox (this will keep your bookmarks and passwords)
2. afterwards go to the firefox menu ≡ > addons > extensions and in case there are still extensions listed there, disable them.
3. finally run a full scan of your system with different security tools like the free version of malwarebytes and adwcleaner to make sure that adware isn't present in other places of your system as well.

Troubleshoot Firefox issues caused by malware

Separate Issue; Your System Details shows;

Installed Plug-ins

Adobe PDF Plug-In For Firefox and Netscape 11.0.07 Adobe PDF Plug-In For Firefox and Netscape 11.0.0

Having more than one version of a program can cause issues.

Adblock Plus {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Your problem is almost certainly caused by your extension ArcadeParlor 1.0 .

Google for information and removal advice. Do you use it? Do you know where it came from?

alan_r said

Your problem is almost certainly caused by your extension ArcadeParlor 1.0 . Google for information and removal advice. Do you use it? Do you know where it came from?

Thank you very much!! It seems to be working, although I have not been on computer very long since I deleted ArcadeParlor. I has been on my computer for a while and I never had problems with pop ups until recently?? But it seems to be working.

howardek said

recently started getting pop up ads, pop up blocker box is check marked, How can I stop pop ups????? This started to occur a few days ago, before that, I never had any issues. It may be related to Mcafee security, but could be anything.

I successfully removed piccolor and other unwanted pop up adds using AdwCleaner. This link will take you to the download page. Norten says it's safe. https://www.how-to-remove.com/downloading/3516/0/

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.

I too started getting absolutely bombarded yesterday with tons of ads at no clear time so it's incredibly difficult to locate and block them. They completely fill my screen and this leaves me no option because everything is covered, they really do cover the lot so my only option is to restart again and again and again. They also leave no trace of being there, so obviously it's a Malware vibe so could you offer any advice whasoever on removing this insanely annoying Malware rubbish. As if I would ever purchase anything from them....ooooh noooo!!! Help always highly appreciated, thank you. Sáss Alæssí

First; You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Adblock Plus {web link} Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Adblock Plus Pop-up Addon {web link} Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.

Forum; Adblock Plus Homepage {web link}

sotofuxi If you continue to have problems I strongly suggest that you start a question of your own with full system details. The original question dates back to last December.