Steps to reproduce:

1. Start Nightly 108.0a1 [Ja] build
   firefox.exe -p

Actual Results:
The right side of the Profile Manager is cut off.

Expected Results:
The right side of the Profile Manager should not be cut off.

Regression window [ja] build:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ac1330b68d3e7b231a177cfa1ac52e1b2199bb84&tochange=826073b561e026d8fbc6a8354081db59727d9f33

FYI,
The offending patch has been backed out in the mozilla-beta channel only and does not affect 107.0b8.
https://hg.mozilla.org/releases/mozilla-beta/pushloghtml?&fromchange=40d2d5014048&tochange=e433b14352f7

:emilio, since you are the author of the regressor, bug 1795224, could you take a look? Also, could you set the severity field?

For more information, please visit auto_nag documentation.

Instead of imposing the min-width as a max-size, make prefwidth act as
it should (as suggesting a preferred width, but with min-content as a
minimum).

This can be reproduced locally by applying a patch like:

diff --git a/toolkit/profile/content/profileSelection.xhtml b/toolkit/profile/content/profileSelection.xhtml
index 3dd1c864f79f1..7e8cbf8ce8c3e 100644
--- a/toolkit/profile/content/profileSelection.xhtml
+++ b/toolkit/profile/content/profileSelection.xhtml
@@ -17,7 +17,7 @@
   data-l10n-id="profile-selection-window"
   orient="vertical"
   prefwidth="min-width"
-  style="min-width: 30em;"
+  style="min-width: 10em;"
   onload="startup();">
 <dialog id="profileWindow"
   buttons="accept,cancel"

Before patch, stuff overflowed. This patch guarantees that everything is
on-screen.

Backed out for causing build bustages on Window.webidl.

Push with failures: https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=testfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel&revision=f456713ddff8f72a0070f3e85f5a44dd6610dadd&selectedTaskRun=T9E1gDE_R_2OLE6wdzD5-A.0

Failure log: https://treeherder.mozilla.org/logviewer?job_id=395654590&repo=autoland

Backout link: https://hg.mozilla.org/integration/autoland/rev/09c0763a61da33c2709a4c640d16a3533c677b38

The regressing bug 1795224 was uplifted to Firefox 107. Does this need to be uplifted too?

No, see comment 1

https://hg.mozilla.org/mozilla-central/rev/f611ae72ddbf

Reproducible on a 2022-11-02 Nightly build( ja-locale) on Windows 10. Verified as fixed on 109.0a1 Nightly(2022-11-15, ja-locale) on Windows 10 and Windows 11.