Seriously irritates me you can’t bother to take the time to provide actual instructions on how you’re supposed to install the damn .dmg file (from which I’ve searched is apparently a MacOS disk image file (wtf)?) Where’s the executable? Jesus Christ
Hi, are you on Mac? See: https://support.mozilla.org/kb/how-download-and-install-firefox-mac
If you are not on Mac, see the relevant article for your OS:
On mobile, go to either the Apple App Store or Google Play, depending on your mobile OS.
Does that get you Firefox? Any further problems?