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Firefox won't open after latest windows update. Nothing restores functionality.

Firefox Launch failure
Justin Credible
Justin Credible

Everything was working fine. I ran windows update on 10/31/26. Afterwards I couldn't open Firefox or Brave browsers. I've tried uninstalling and reinstalling the updates. I've uninstalled and reinstalled Firefox. I've reinstalled windows 11 three different times. There are approx. 4 programs that won't open or function at all. Nothing changes when I boot up in safe mode, or when I disable my anti virus. I've tried system restoring 4 times but it fails every time. Ironically enough, Microsoft's Edge browser operates perfectly. For some reason, if I go thru the microsoft store and choose the firefox app it downloads and works but not like it did when I downloaded it directly from mozilla. I can't make it my default browser, I can't pin it to the taskbar, and the shortcut target is the My PC folder. I've spend hours chatting with microsoft tech support. I'm at my wits end and don't know what else I can try. Any advice would be greatly appreciated.

I'm running Win.11 25h2 on an Inspiron 15-3511

Everything was working fine. I ran windows update on 10/31/26. Afterwards I couldn't open Firefox or Brave browsers. I've tried uninstalling and reinstalling the updates. I've uninstalled and reinstalled Firefox. I've reinstalled windows 11 three different times. There are approx. 4 programs that won't open or function at all. Nothing changes when I boot up in safe mode, or when I disable my anti virus. I've tried system restoring 4 times but it fails every time. Ironically enough, Microsoft's Edge browser operates perfectly. For some reason, if I go thru the microsoft store and choose the firefox app it downloads and works but not like it did when I downloaded it directly from mozilla. I can't make it my default browser, I can't pin it to the taskbar, and the shortcut target is the My PC folder. I've spend hours chatting with microsoft tech support. I'm at my wits end and don't know what else I can try. Any advice would be greatly appreciated. I'm running Win.11 25h2 on an Inspiron 15-3511

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