I did a brief search on this and found the following information. The first link is an explanation from Mozilla on how to initiate kiosk mode. I didn't see any other CLI options there so I did another search which led me to the second link. This link is a comprehensive list of CLI options that Firefox allows. I imagine this should be sufficient to get you moving further. Hope this helps!
[EDIT] To add additional clarity to my answer if you look at the first link I referenced the excerpt the OP quotes is under the Recommended configuration heading. Under that heading are subheadings Command Line Arguments and Policy configuration. Both subheadings are explicitly referenced in the quote the OP provided. The Command Line Arguments subheading is what the OP is asking about. Under this heading a brief example is provided with a simple explanation.
All command line arguments for Mozilla Firefox Command Line are located within the second link that I referenced.It doesn't matter whether you're using kiosk mode or doing general configurations via the CLI. All information for Command Line Arguments will be located in the second link. There's no additional page containing Command Line Argument information/explanation. Feel free to search their wiki which is where the information in that second link is from.
You can also cross reference the information from the example in the first link with their Command Line Argument documentation. Additionally, if you look at the Command Line Arguments documentation it clearly states that --kiosk
only accepts a single value and that's a URL of the page you'd like open when Firefox starts.
Sources
- Firefox Enterprise Kiosk Mode
- Firefox/CommandLineOptions