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Can‘t reslove DNS via vpn on Linux firefox v141 but ok on v140 or newer version

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Please help, a very tricky problem: Work Scenario: I need to use the company-provided VPN software to access the internal network. Its principle involves redirecting requests to a virtual network interface before sending them out. On Ubuntu 24.04, both Firefox 140 and older versions can access both internal and external networks normally.

Issue After Upgrading Firefox: After upgrading to Firefox 141, all connections (internal and external) fail when the VPN is active.

Key Symptom Observed: In the Firefox networking debug page (about:networking#dns), the DNS suffix should display as localdomain, but after upgrading to Firefox 141, it appears empty.

Please help, a very tricky problem: Work Scenario: I need to use the company-provided VPN software to access the internal network. Its principle involves redirecting requests to a virtual network interface before sending them out. On Ubuntu 24.04, both Firefox 140 and older versions can access both internal and external networks normally. Issue After Upgrading Firefox: After upgrading to Firefox 141, all connections (internal and external) fail when the VPN is active. Key Symptom Observed: In the Firefox networking debug page (about:networking#dns), the DNS suffix should display as localdomain, but after upgrading to Firefox 141, it appears empty.
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627864699 Umnikazi wombuzo

and update: Work Scenario:

DNS suffix works on Ubunutu22.04 with firefox141


It now seems unrelated to the localDomain issue. After modifying /etc/resolv.conf, the DNS suffix displays correctly, but the network is still inaccessible. This is frustrating

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