If I'm not mistaken firetools is a gui for firejail. Never used it. Firejail is extremely simple to use, no need for graphical interfaces. With that out of the way, you need to launch Icecat via its executable. I haven't used the damn thing in ages so I don't remember exactly but you can easily find out if you open a terminal and try to launch Icecat from the terminal. When you succeed doing so you will find your answer because whatever command launched successfully Icecat is the same command preceded by 'firejail' to launch Icecat sandboxed..

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