Official announcement: https://kde.org/announcements/plasma/5/5.27.4/
Full changelog: https://kde.org/announcements/changelogs/plasma/5/5.27.3-5.27.4/
It is the blog of Nate Graham, a KDE developer, that offers a weekly recap of most important KDE news, bug fixes, new features, major and minor releases and the future of this amazing and popular DE project.
This bug was first reported on 2021-12-06 with KDE Plasma 5.23.4 and there is still no fix in version 5.27.3!
https://bugs.kde.org/show_bug.cgi?id=446581
The freeze is presumably caused by Firefox attempting to update the clipboard and show a notification at the same time.
A temporary solution would be to disable Firefox notifications:
https://support.mozilla.org/en-US/questions/1283277
https://support.mozilla.org/en-US/questions/1345694
Trying to install firmware updates for my Dell gives the following error message:
The input is not of cabinet format

The solution is to install the update manually from the command line using fwupdmgr:
1)fwupdmgr get-updates 2)fwupdmgr update You can find additional information about fwupd in Arch linux wiki: https://wiki.archlinux.org/title/fwupd

Yes, it’s been a month but still quite important news 🙂