Firefox for Mac Download Firefox. You can get it for free at the Mozilla website. Open the DMG file. Once the download is complete, the DMG file should open automatically. Install the application. Drag the Firefox.app file into your Applications folder. Put Firefox on the dock.How do I set up Mozilla Firefox?
Steps Open your Mozilla Firefox browser. Click the orange drop-down box from the extreme top-left corner of the browser window. Click "Options" from the box that is displayed. Utilize the keyboard shortcut Alt+P to get you straight to the "Home Page" selection box. Type the first website you want to load in the first tab. Type a vertical bar (| ).