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

windows 10 tells me mozilla firefox is an incompatible programme. I have tried removing it and reinstalling it etc but still not working properly.

  • 1 ŋuɖoɖo
  • 1 masɔmasɔ sia le esi
  • 1 view
  • Nuɖoɖo mlɔetɔ FredMcD

more options

I bought a new Acer in Jan last year. It has Windows 10 on it. Now Mozilla Firefox quickly goes to "firefox is not responding" and the whole computer is too slow to use. I have checked my firewall and it says Firefox is allowed. I have reinstalled Firefox and gone through the other processes. How do I get Windows 10 to accept it?

I bought a new Acer in Jan last year. It has Windows 10 on it. Now Mozilla Firefox quickly goes to "firefox is not responding" and the whole computer is too slow to use. I have checked my firewall and it says Firefox is allowed. I have reinstalled Firefox and gone through the other processes. How do I get Windows 10 to accept it?

All Replies (1)

more options

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

  • Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
  • Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}


Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options)
key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?