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Mozilla wants users to take part in a survey about browser features
(connect.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Nope. A PWA gives you a browser window with no menu bars and the icon of the age vs the browser. It's treated as a separate entity in your start bar for task switching.
Many of us still use Chromium for that one feature, while using Firefox for everything else.
You can do that with command line arguments
Not with FF. Well, not without massive CSS app customization and separate profiles which is not officially supported.
Yes you can. Try running Firefox --help
No, you cannot. There have been tickets open about this for ages. You are talking about opening a URL, not a PWA.