This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How do I stop blocked popup opening new instance of Firefox instead?

  • 3 replies
  • 2 have this problem
  • 8 views
  • Last reply by FredMcD

more options

I have blocked popups. They now seem to bypass the block by opening new instances of Fifefox. I never use more than one instance, I just use multiple tabs. How can I prevent multiple instances of Firefox? [I have explained this as best as I can].

I have blocked popups. They now seem to bypass the block by opening new instances of Fifefox. I never use more than one instance, I just use multiple tabs. How can I prevent multiple instances of Firefox? [I have explained this as best as I can].

All Replies (3)

more options

Do a malware check with several malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure that you update each program to get the latest version of their databases before doing a scan.

You can also do a check for a rootkit infection with TDSSKiller.

See also:

more options

Perhaps I was unclear. Unscrupulous advertisers and others used to use popups, which I can deal with. Now they open a new instance of Firefox. I can find no way to stop this.

more options

That's what pop-ups do.

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).