Depending on changes between the two versions, some files in a profile may not be downwards compatible. Open a terminal and enter the following command:įirefox 67's downgrade protection prevents accidentally starting Firefox in a profile running a later version of Firefox. If you use Firefox Nightly, you can enter:Ĭd /Applications/FirefoxNightly.app/Contents/MacOS Open terminal and enter the following command:Ĭd /Applications/Firefox.app/Contents/MacOS The following examples show the use of the -ProfileManager command, which will open the profile manager prior to starting Firefox: In general, the syntax is as follows:Īpplication -option -option "argument" -option argument Multiple command line options can be specified. In some cases, option arguments must be enclosed in quotation marks (this is noted in the option descriptions below). Some options have abbreviations, for example, -editor can be abbreviated as -edit (available abbreviations are described in the text below). If the option contains arguments, enter the argument after the option. Blank spaces ( ) separate commands and parameters.Ĭommand line options follow the command to start the application.Command parameters, except profile names, are case insensitive.Command parameters containing spaces must be enclosed in quotes, such as "Joel User".You can open the command line interface by pressing Shift+F2.īut first, let's describe the syntax rules that apply for all options. This page describes the commonly used options and how to use them. You can also control how Mozilla applications open, which components open initially, and what the components do when they open. For example, if you have multiple profiles you can use command line configuration options to bypass the Profile Manager and open a specific profile. 1.3.3 -CreateProfile "profile_name profile_dir"Ĭommand line options are used to specify various startup options for Mozilla applications.
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