autoconfig on Firefox msix
I installed the msix package from Microsoft Store. We can't add our autoconfig to the msix version? We don't have access to C:\Program Files\WindowsApps\Mozilla.Firefox_xxx.x.x.x_x64__n80bbvh6b1yt2\VFS\ProgramFiles\Firefox Package Root so we can't put the needed files there. So were are we supposed to put the autoconfig files? Firefox seems to have added support for the similar situation on linux with flatpak and snap. https://bugzilla.mozilla.org/show_bug.cgi?id=1785278 There isn't a way to use autoconfig on Windows if we choose to install Firefox from the store of the OS?
All Replies (1)
Hi! You're absolutely right — unfortunately, the MSIX version of Firefox from the Microsoft Store does not currently support autoconfig, and the main reason is that Store apps are sandboxed by Windows.
This means you don’t have access to the installation directory where autoconfig.js and mozilla.cfg normally need to be placed (e.g., under C:\Program Files\WindowsApps\...), so you can’t add or modify those files.
On Linux, Firefox added support for autoconfig in sandboxed environments like Flatpak and Snap (see Bug 1785278), but there’s no similar support for MSIX on Windows yet.
If you need to use autoconfig (for enterprise deployments or custom configurations), I recommend installing Firefox using the regular EXE or MSI installer, which you can download from: https://www.mozilla.org/firefox/enterprise/
That version gives you full access to the install directory and full support for autoconfig, policies.json, GPO, etc.
Hopefully, autoconfig support will be added to the MSIX version in the future, but for now, the classic installer is the best choice for managed environments. Let me know if you need help setting it up!
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