The Firefox web browser supports a number of command line options that it can be run with to customize startup of the web browser.
You may have come upon some of them in the past, for instance the command -P "profile name" to start the browser with the specified profile, or -private to start a new private browsing session.
The following guide lists important command line options for Firefox. It is not a complete list of all available options, as many are used only for specific purposes that have little to no value to users of the browser.
You find the complete listing of command line options on the Firefox Developer website. Note that many of the command line options work in other Mozilla-based products, even third-party programs, as well.
Profile specific options
Browser specific options
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