A small addition: Firefox 150.0 (from Mozilla’s PPA) is similarly affected for me, so this is indeed an upstream one.

This looks like #2851 on the COSMIC issue tracker, affecting Firefox. They’ve also reported it upstream.

The COSMIC issue has been closed as having been fixed by 150.0, but there’s at least one dissenter.

Anyway, I’m using a regular Gnome desktop on Ubuntu 24.04, with Wayland, Librewolf 150.0, and funnily enough, for me this only appeared with 150.0 and not before. So now I am affected.

The workaround of toggling widget.wayland.fractional-scale.enabled mentioned in the COSMIC issue seems to work (i.e. after the menus have died, open about:config, toggle the setting from default trueto false, then immediately back to true).

I can’t remember when exactly this began, but for maybe a few weeks now the first clicks of the share button in the web UI just give a ”Sharing is not available for private podcasts” notification at the bottom corner. This is for any and all podcasts, so not just actually private ones. After two or three clicks the sharing dialog then finally does pop up.

My main browser is Librewolf (based on Firefox), but the same issue occurs in Vivaldi too (which is based on Chromium).

There’s nothing in the browser’s console about this (no errors at all).

I made a screencast demonstrating the issue: https://youtu.be/5_LieFpsz0I

Cool, I’m not going crazy! I’ve had a very, very similar issue for a couple of weeks now. Identical in fact, except for the triggers and frequency: three incidents so far, since the first one on January 11th, with the last two within two days earlier this week. In all instances I’ve had Twitch playing video in Librewolf, when suddenly the desktop freezes, leaving only a 500 ms bit of the audio looping endlessly. I had forgotten about magic SysRq, so I have yet to try if it works; I’ve also just done a hard reset instead.

If the logs posted by anonymousdormouse are related to the issue, then that’s one difference wrt. what’s happening here: there’s been nothing related to the problem in any logs. The system seems to just die instantly and completely.

Ubuntu is on an NVMe drive instead of a HDD, and it’s the only OS on the drive.

I have done one pass of memtest to rule out memory errors.

My system doesn’t have Nvidia, it’s using the integrated GPU of a Core i7-8700 with two external displays (one DP-connected, one HDMI-). (This is a Dell XPS desktop that originally came with an external Nvidia GPU, but I ripped it right out before installing the system. I’ve had enough bad experiences with Nvidia to know to avoid them whenever possible.)