Firefox window now restored

[cdorfer]

First of all, huge thanks for programming this! I would have spent weeks doing it myself if I hadn't found it on your Github.
That being said, similar to the issue with Chrome also Firefox is not restored on my OS 11.6 M1.

[relikd]

As said before, most of the restore issues result from the different window systems being used – one for getting the window list vs. the other setting the window positions (#1 (comment)). Currently, I see no way to detect these hidden, additional windows. If you find a way, or if you have another app (Mjolnir, or ...) that does restore the windows properly, let me know. Additionally, I currently do not have access to a second screen, so I can't really test and debug this. But I'll keep this issue in mind until I can test it.