With enabled devtools 7.7.7 on Firefox 139.0.4 on Windows 11 does not show XML files correctly

[knoppixmeister]

Latest devtools v7.7.7 on Firefox 139.0.4 on Windows 11 broke XML files viewer ability.
With disabled extension it possible to see XMLs as formatted files.

[stripTM]

Confirmed for Firefox Ninghtly in MacOS
141.0a1 (2025-06-17) (aarch64)

[webfansplz]

Could you please help to provide a mini repo? 🙏

[MelkorCC]

@webfansplz Reproducer:

Open https://www.w3schools.com/xml/note.xml in FireFox with VueDev Tools 7.7.7 enabled.
You should get the following output:

Now disable VueDev Tools and reload the page.
You should get the following output:

So yeah, i can confirm that VueDev tools break the XML viewer of FireFox.