1658770 - Firefox drop-down menu (from menu bar) wrongly size on scaled display

Status: RESOLVED DUPLICATE of bug 1588330

(Firefox :: Menus, defect)

Description

[giuseppe.passino]

Attachment: Capture1.PNG

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0

Steps to reproduce:

My windows 10 laptop setup is an external 1920x1080 at 100% zoom and the laptop screen set-up as secondary, at 2560x1440 scaled at 150%.

I ran Firefox (79.0 - 64-bit, extensions disabled) on the scaled display and clicked on the hamburger (main, top-right) icon.

Firefox (79.0 (64-bit)) works fine on the primary (unscaled) display, but on the scaled display all the drop-down menus (extension, but also hamburger from firefox) are too small, and the contents are either not entirely visible (typically for the extensions) or need a scrollbar (like the main firefox menu).

I tried to run firefox with extensions disabled but the problem persists.

Actual results:

The drop-down menu was too small (vertically) and there was a scroll-bar to scroll to the bottom of the menu. Only a few items at the time were visible.

Also, drop-down menu form extensions behaved even worse as there was no scroll-bar so they were useless.

Expected results:

The full drop-down menu should have been shown. Note that this happens when firefox is in the unscaled - primary monitor.

Comment 1

[BugBot [:suhaib / :marco]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Masatoshi Kimura [:emk]]

Is this a recent regression?

Comment 3

[giuseppe.passino]

Since I had this monitor configuration (mid July) the bug has been present.

Comment 4

[giuseppe.passino]

Looks similar to https://bugzilla.mozilla.org/show_bug.cgi?id=1588330

Comment 5

[Jared Wein [:jaws] (please needinfo? me)]

Yeah, this looks the same as bug 1588330. I'm going to close this as a duplicate of that bug. Thank you for filing this and bringing bug 1588330 back to my attention.