Hello Mozilla Connect Community, I’m Chance York, a User Researcher on the Firefox User Research team. I’m reaching out because our team has created a survey to gather opinions on a handful of browser features, some of which were suggested previously on Mozilla Connect. Your feedback on this survey...
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.