I've now reproduced on a freshly rebooted ubuntu instance. I have a firefox profile called "test" that I used. That profile doesn't have historical windows to open on start, doesn't have any extensions that I've added.
Launch firefox: firefox -P test Use C-N to open two new windows. Return to the terminal. Type "firefox https://www.lemonde.fr/" (for example). In my case, the window that received the new tab was not the last one viewed. Now choose a different firefox window, not the one that just opened a new tab. Open a new tab, maybe close it, then return to the terminal, repeat. I would expect the new lemonde.fr tab to open where I had just interacted, but this isn't the case. Possibly relevant: - I've configured firefox to open new tabs and note new windows when sent a signal to open a new page. - I'm using the i3 window manager (so some windows maybe be unmapped due to tiling) with a focus-follows-mouse policy. I've also reproduced this starting firefox in safe mode: firefox -P test --safe-mode -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1810902 Title: firefox picks unpredictable window for opening new content To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1810902/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs