Greetings, all,

I am having a problem with a new install of KUbuntu (22.04), but am uncertain if the problem is in KDE, firefox, or potentially thunderbird (unlikely, but possible).

The background situation is that I have Firefox open in virtual desktop 1, and am reading an email in virtual desktop 2. I want to open multiple links in the email for reading later. However, whenever I click and open a link, Firefox moves from virtual desktop 1 to virtual desktop 2, forcing me to have to move it back before I can continue with the email (and so I can find FF later). This is new behavior, the previous install of KUbuntu did the correct thing of having Firefox remain in the virtual desktop it was opened in. I have been through the Firefox and KDE system settings, and can not find a setting to return this system to sane behavior. DDG searches have not located anything useful because the appropriate search terms provided tons of useless and irrelevant results. If anyone knows how to keep an app from wandering aimlessly through the desktop, please let me know, and thanks in advance.

FWIW, the relevant system setup is KUbuntu 22.04, Firefox 114.0.1 64bit, and Thunderbird 102.11.0 64bit.

Hi, I think you may be able to configure the mouse.. or screen focus with kde settings.

System Settings/Window Management/Window Behaviour/Focus

check the settings around there... Hope this helps. :-)

Unfortunately, that was not it. I had found that earlier, and it still does not do what I need. Setting the window activation policy does not prevent Firefox from migrating from its proper virtual desktop, I tried each policy and all of them except 'click to focus' have other deleterious behaviors. But all of them allow Firefox to jump desktops. Setting the Focus stealing prevention to Extreme prevents Firefox from stealing focus, but it still jumps from its proper desktop to the one Thunderbird is in.

And I found it. It is in Firefox, not Kubuntu system settings. But it is a 'non-standard' configuration. Found it in about:config and set browser.tabs.loadDivertedInBackground to False.

And it changed because it used to be called OpenInBackground. But searching using Firefox as a search term provided negative results. Searching for 'Thunderbird moves browser', and the first result had exactly what I wanted: An article explaining that Thunderbird is not the problem, but Firefox is. So.... Yeah.

Thank you for attempting to help. It can be difficult when you have three potential places to resolve a problem like this.

double-up...

Firefox does that here for me too, but I just have 2 screens... so

I use the window properties ...

right-click the window bar... more actions... configure special aplication ()...

you can force geometry, space and place. I do this for firefox in plasma-kde5.