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Firefox stops loading pages while other browsers on the same system continue to work. Outlook for web?

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SherSlick
SherSlick
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A few times now I have suddenly found Firefox unable to load any web pages all while other browsers and apps on the same Windows 11 system continue to function as expected. At first thought it was IPv6, so disabled that at the system level to no effect. Additionally confirmed that DNS over HTTPS is disabled as our firewall blocks direct access to known public DNS servers.

Today however I have noticed that Firefox seems to get into this state after I execute some actions in Microsoft Outlook web (https://outlook.office.com/mail/inbox/) , which I do have running in a container specifically for work pages (Firefox Multi-Account Containers)

If I force-close FireFox and reopen it, it will continue to function as expected.

A few times now I have suddenly found Firefox unable to load any web pages all while other browsers and apps on the same Windows 11 system continue to function as expected. At first thought it was IPv6, so disabled that at the system level to no effect. Additionally confirmed that DNS over HTTPS is disabled as our firewall blocks direct access to known public DNS servers. Today however I have noticed that Firefox seems to get into this state after I execute some actions in Microsoft Outlook web (https://outlook.office.com/mail/inbox/) , which I do have running in a container specifically for work pages (Firefox Multi-Account Containers) If I force-close FireFox and reopen it, it will continue to function as expected.

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