Next time you see it, could you copy/paste the address of the page?

Sometimes unwanted popups are caused by an extension. You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then cast a critical eye over the list on the right side. All extensions are optional. If in doubt, disable.

Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Any improvement?

If you get a pop-up message asking to update Firefox or plugins or scanning for malware then such a message is likely a scam and you should never respond to such an alert to avoid getting infected with malware.

• Only update Firefox via "Help > About" or by downloading and installing Firefox from the Mozilla server and never via a pop-up or link on a web page.
• plugins should only be updated via the plugin itself or by visiting the home page of the plugin.

I've just had a pop up tab happen, but sadly I didn't read this before it happened. But I have these plugins: OpenH264 Video Codec by Cisco Systems Primetime Content Decryption Module by Adobe Systems Shockwave Flash Widevine Content Decryption Module by Google Inc. 2 blank plugins, one with a description 2 NVIDIA 3D Vision Plugins and Silverlight, which is currently disabled.

No extensions have been installed by themselves.

Hmm, I don't like the idea of blank plugins. Sounds suspicious. If you look at the data extracted by the script on my plugin lister page, do they look legit?

https://www.jeffersonscher.com/res/plugins.html

I suppose "if in doubt set to Never Activate" might be safest in the short run.

You can also check the pluginreg.dat file in the Firefox profile folder if the about:plugins page doesn't give useful info about this plugin.

You can use this button to go to the current Firefox profile folder:

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

I'll try that jscher. See if it works. Also, I have a pop up ad that popped up earlier, about Microsoft, in a TTS (Text To Speech) voice saying that my computer was infected with a virus. It asked me for something in a pop up alert window, and didn't let me click out when it appeared. Thankfully I was able to click out of the alert window, and the tab altogether.

jscher2000 said

Hmm, I don't like the idea of blank plugins. Sounds suspicious. If you look at the data extracted by the script on my plugin lister page, do they look legit? https://www.jeffersonscher.com/res/plugins.html I suppose "if in doubt set to Never Activate" might be safest in the short run.

npnv3dv.dll is good npnv3dvstreaming.dll is good NPSWF32_22_0_0_209.dll is good

None of these are the problem, and I just got another 'Microsoft Security' pop up. Do I need to reinstall Firefox?

Can you associate the ads with a particular website?

If they seem to open independently of the site you're viewing, that might be something generated from your system, either by an extension or externally (something sending an address to your default browser).

You had said:

No extensions have been installed by themselves.

I'm not sure how to interpret that, but I'm guessing you mean that you reviewed the Extensions and trust them all.

jscher2000 said

Can you associate the ads with a particular website? If they seem to open independently of the site you're viewing, that might be something generated from your system, either by an extension or externally (something sending an address to your default browser). You had said:

No extensions have been installed by themselves.

I'm not sure how to interpret that, but I'm guessing you mean that you reviewed the Extensions and trust them all.

They seem to pop up when I visit sites i usually go to, or find. For now, I'm disabling my current extensions. The sites don't pop up all the time, just sometimes. Most currently, the Microsoft one.