I'm a beginner Mac OS user.
When I open Firefox I receive the dialog below, why doesn't Firefox just start? What is the point of the below dialog?
Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up.Sign up to join this community
This isn't a dialog, this is the result of mounting (opening) the Firefox.dmg (think of it as an archive or drive image). For mac users it's obvious - you should drag the FF icon to the Applications folder shortcut (the blue folder). This will copy the Firefox application in the /Applications/ folder. Then just unmount (eject) the Firefox.dmg archive and start Firefox from Applications (like you start the rest of your applications).
The file what you downloaded, is an "DMG" archive type (like ISO image).