I've just bought a new Macbook Air M1 to replace an older Mcbook on which I had Firefox as my default browser. The new Macbbo wont let me make Firefox my default! On the Firefox browser "genreal" when it says "make default"I press it and it still shows "firefox is not your default"! If I go into system preferences it says that Firefox is my default!!! If I shut down and restart Firefox reopens with the new start again login page--i.e. It wont open with my usual open tabs etc as it does on my old Mac!! Help!