I’m using plasma 5.18, thunderbird 91.2.0, firefox 93.0
Each time I boot my computer some things do not work with GTK applications, for example, when I click on a text box to introduce login+password saved password do not work, when I click on a menu, it does not unfold. It happens both thunderbird and firefox. Then I go to settings-GTK change font and I change the font (I have seen that change from deepin to high contrast or reverse always work) and It works fine … until next reboot.
I boot the computer, I login-> menus don’t work. I change the font, menus work.
I log-ou then log in again, menus continue working. I have tried it several times, still working.
I create a new user, it works fine.
I log out-log in with the new user, still work fine.
I log-out log-in alternatively with both users, it works
I reboot -> my normal user does not work (until font change), the new user works
I have seen that on log-out + log-in the plasma desktop loads (for my normal user) way faster that when I do a reboot (even if I make the reboot and wait a long time, like 10 minutes) to log-in
I assume that can be explained by the fact that a lot of the read-only memory pages (the “code”) of the KDE programs that are needed by your login are still cashed in memory when you logout/login. They are of course not at first login after a boot.
You probably will see the same when you start e.g. Firefox first time after login, stop it, and start it again. Second time will be quicker.
BTW, your list of tests seem to point to something in the configuration of the original user. When I read that list correct, the problem never happens with the new user.
I found this topic by searching on Thunderbird.
I tried Tannington’s approach and it did not seem to help, so I backed it out since it really trashed my highly configure dual display layout.
I acknowledge that he warned us about side effects
My situation is very similar to what fperal describes.
My issues appeared, I think, when I did an on-line zupper dup upgrade from 15.2 to 15.3, but I cannot swear that it did not appear with a recent Thunderbird update.
Based on more general google searches, it seem other distros are having similar issues with most recent Mozilla offerings such as Firefox and Thunderbird running KDE.
On startup, they seem to be using Gnome base file helpers and perhaps default applications setups.
A common suggestion is to start Thunderbird using this method
Exec=GTK_USE_PORTAL=1 thunderbird %u
That does help, Thunderbird now presents Dolphin based file menus but default system applications still seems focused on Gnome.
For example, in Thunderbird, attempting to open an attached file.docx.
Tbird wants to choose calibri, which I have installed but is not on any settings list for docx files that I can find.
And the menu option to save all attachments just does not work.
I don’t know enough to think this is a packaging issue or fundamental change to Mozilla build systems.
I have seen similar issues on Arch, Mint and Ubuntu forums.
As I thought it may be a GTK issue first I tried to remove only the cache and the .gtkrc-2.0 … it didn’t work.
Then I tried to use Exec=GTK_USE_PORTAL=1 option. I liked it because I way prefer native dialogs… but the issue continued happening.
Then I removed .config and .local and the firefox, thunderbird… worked fine, so it seemed to be a issue of my profile.
But as I have a lot of configuration I restore them to their previous state to try a more fine searching of the problem when I had free time.
I was In the process of changing my computer. I had installed a new Opensuse 15.3 in a new hardware, I created the users with the same ids than in my PC, and I rsynced my whole /home to the new PC … and in the new PC the issue with tb and ff has dissapeared with the same user profile that fails in the old one, so it is not completely a profile issue.
