1693474 - Firefox crash with fractional scaling on Wayland with custom gnome theme

Status: UNCONFIRMED

(Core :: Widget: Gtk, defect, P3)

Description

[grsm]

Attachment: Debug info

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:85.0) Gecko/20100101 Firefox/85.0

Steps to reproduce:

Clear installation of browser with deleted settings (.mozilla folder) Open firefox go to menu tools -> web development, mouse left click submenu not open. And after mouse right-click at submenu item browser crashing with Gdk-Message: 21:14:29.077: Error 71 (Protocol error) dispatching to Wayland display. This error reproduce when some custom themes from gnome-look was installed.

Reprodusing video https://youtu.be/6uyUYPTwXT4

gsettings set org.gnome.mutter experimental-features "['scale-monitor-framebuffer']" enable fractional scaling on wayland

Then go to gnome setting -> display->choose 125 or 150%

More informative crashreport

https://crash-stats.mozilla.org/report/index/33dce90c-4423-44c6-8888-fa8b90210217

id bp-33dce90c-4423-44c6-8888-fa8b90210217

i'm use settings-> accessibility-> Large Text

Also can add custom flag layout.css.devPixelsPerPx in about:config = 2.3

Sample of themes.

https://www.gnome-look.org/p/1334194/ (crash with it)

https://www.gnome-look.org/p/1230631/ (crash with it)

Actual results:

Submenu not opened, browser crashing

Expected results:

Opened submenu.

Comment 1

[grsm]

Attachment: about:support

Comment 2

[grsm]

Attachment: menus

Comment 5

[grsm]

So with some themes it works fine, but with somes it crashed. Cause it you cannot reproduce it by ownself.

FOR DETAILS SEE THE VIDEO!

Comment 6

[grsm]

https://youtu.be/6uyUYPTwXT4

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Gtk' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 8

[BugBot [:suhaib / :marco/ :calixte]]

The product::component has been changed since the backlog priority was decided, so we're resetting it.
For more information, please visit auto_nag documentation.

Comment 9

[Martin Stránský [:stransky] (ni? me)]

Can you please try to attach more crash ID? The one attached here looks incomplete. It's better to have 3-4 ones for approximation.
Thanks.

Comment 10

[grsm]

https://crash-stats.mozilla.org/report/index/48c90867-1724-40ad-971e-44dab0210218
bp-48c90867-1724-40ad-971e-44dab0210218

bp-0e6be179-4ec9-4fc9-aa50-a41070210218

https://crash-stats.mozilla.org/report/index/0e6be179-4ec9-4fc9-aa50-a41070210218

bp-071fc5be-b51f-43fb-aba3-ae1a40210218

https://crash-stats.mozilla.org/report/index/071fc5be-b51f-43fb-aba3-ae1a40210218