Created attachment 1450524 [details] firefox-wayland showing help menu Description of problem: Firefox wayland displays dialogs double the expected size when running on a hidpi screen. Please see attached screenshots, which compare firefox-x11 and firefox-wayland. firefox-x11 behaves as expected. In addition to the obvious display problems, it seems that mouse clicks go in the wrong place (I tried to click, but nothing happens). I assume that this is somehow realted, but that is harder to quantify. Version-Release number of selected component (if applicable): firefox-60.0.1-6.fc28.x86_64 How reproducible: 100%, I restarted firefox a few times and I always get the same result. I had a low-dpi screen connected to this laptop, and I didn't restart the session yet. I'm not sure if this could have any influence.
Created attachment 1450525 [details] firefox-x11 showing the help menu (proper scaling)
Created attachment 1450526 [details] firefox-wayland ask password dialogue
Created attachment 1450527 [details] firefox-wayland showing html menu
Can you please retest with latest build from https://firefox-flatpak.mojefedora.cz/ ?
*** Bug 1595779 has been marked as a duplicate of this bug. ***
Yes, it seems greatly improved with nightly. I'm using https://bugs.freedesktop.org/query.cgi?format=report-table as a test case. Menus are displayed properly mostly. One strange effect that I'm observing is that the menus are initially displayed at ~half size, and then after a fraction of a second are scaled to the expected size. This does not occur under x11. It took me quite a few tries, but I managed to print-scrint the half-size window, see attached screenshot.
Created attachment 1473601 [details] firefox-nightly menu immediately after clicking, half expected size
Created attachment 1473602 [details] firefox-nightly menu after a few seconds, normal size
(This is just a minor visual glitch though... doesn't influence usability)
After some futher testing, occasionally the menu will get stuck at the reduced size.
(In reply to Zbigniew Jędrzejewski-Szmek from comment #7) > Created attachment 1473601 [details] > firefox-nightly menu immediately after clicking, half expected size Do you mind do file upstream bug about at at bugzilla.mozilla.org and cc me there? Would be better to track it there. Thanks.
This bug appears to have been reported against 'rawhide' during the Fedora 29 development cycle. Changing version to '29'.
Should be fixed now.