The blue social bookmark and publication sharing system.
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I went with this in the end as it is recommended by a i3 maintainer in a Reddit post.
You have to install i3ipc in your global Python for this first (pip3 install i3ipc). Then add a startup script that runs:
i3ipc
pip3 install i3ipc
/usr/bin/python3 ~/.config/i3/focus-last.py And add this to i3/config:
/usr/bin/python3 ~/.config/i3/focus-last.py
i3/config
bindsym $mod+Tab exec "/usr/bin/python3 ~/.config/i3/focus-last.py --switch"