Window titles not saved across restarts with Firefox startup option "Open previous windows and tabs" in use

[Boolean263]

Steps to reproduce:

1. In Firefox preferences, enable the General → Startup option "Open previous windows and tabs"
2. In Tabby, give names to any open Firefox windows
3. Exit Firefox
4. Start Firefox

Current behaviour: Windows are named "Window 1", "Window 2" etc. in Tabby

Desired behaviour: Windows keep the names they had in Tabby across restarts

[mlncn]

Experiencing the same bug.

Also wondering if we can get the Tabby window titles to show up on the window itself, such as when using the OS to choose a window. Mentioning it here because the same code might fix both. Window Titler of course has this capability; Container Tab Groups does also (though there it only ever said "No Container" for the way i used it lol).

[sbliven]

It would be awesome if titles were persisted in a way that's compatible with Window Titler.

[mlncn]

Winger does this too (successfully saves the window title between sessions, that is).