The parameter -no-remote lets you run multiple Firefox installations side-by-side.
The second option forces Firefox to load a specific profile or the profile manager on startup. Option 2: Adding a profile parameter to the Firefox shortcut You may also use 'launch profile in a new browser' to check it out without switching to it permanently. Select 'Set as default profile' to assign a new profile to the installation.If you cannot locate it using the folder name, you may use trial and error until you get the right profile, or use open folder to browse the profile folder and check it out. The page displays the current profile at the top and any unused profile (that the current Firefox installation does not touch) below.The page that opens displays all known profiles and the paths assigned to them. Load about:profiles in the Firefox address bar.Option 1: Set a default profile for Firefox in the interface