
Blocked cookies
I have been trying for months to access Microsoft365 but I am constantly told that I cannot access it as Firefox is blocking Cookies relevant to this
I have tried every solution I can find on the internet but none of them work for me In desperation HELP
Firefox and Windws 10
All Replies (1)
Firefox has strong privacy protections, especially in Enhanced Tracking Protection (ETP) and Strict Mode, which can block: Third-party cookies ,Cross-site tracking cookies Storage access for embedded login frames (like Microsoft’s login.microsoftonline.com)
1. Check Firefox's Privacy Settings Go to: Settings → Privacy & Security → Enhanced Tracking Protection Set it to Standard (not Strict or Custom).
This allows necessary cookies for Microsoft 365.
2. Add Microsoft Domains to Exceptions Scroll to Cookies and Site Data → Manage Exceptions and add: https://login.microsoftonline.com https://office.com https://microsoft365.com
Set them to Allow. 3. Disable "Total Cookie Protection" for Microsoft Sites If you're using Firefox Containers or Strict ETP, it may isolate cookies per site. You can: Temporarily disable containers. Use a non-container tab for Microsoft 365.
4. Clear Site Data Sometimes corrupted cookies cause persistent issues: Settings → Privacy & Security → Cookies and Site Data → Clear Data
Then restart Firefox and try again. 5. Try Safe Mode Run Firefox in Troubleshoot Mode to disable extensions: Help → Troubleshoot Mode This helps rule out interference from privacy extensions like uBlock Origin, Privacy Badger, etc.