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No doubt how you installed it is at the root of your issue, since that version is not in the Stretch repositories, or even upstream Debian, nor any other distro, unless you really meant 0.9.56. https://repology.org/metapackage/firejail/versions
Have you looked at the permissions or used ldd command on the icecat binary? I'm going to assume you tried running it without firejail and it works? Is it a secret where it came from? Who said it was a stable version? Since you don't mention following any directions for installing it, or running it, I'm guessing there aren't any?
bw123 wrote:Have you looked at the permissions or used ldd command on the icecat binary? I'm going to assume you tried running it without firejail and it works? Is it a secret where it came from? Who said it was a stable version? Since you don't mention following any directions for installing it, or running it, I'm guessing there aren't any?
I got it from the mirror http://ftpmirror.gnu.org/gnuzilla/. Yes, it runs without firejail. I don't know what I'm supposed to do with the permissions or ldd information. I called it "stable" to distinguish it from the alpha version. It's 8 months old and in other apt-based distros' stable repos, so I assume it's fairly stable. It's not installed; I'm just trying to run the executable.
I solved this by moving the entire icecat folder into my home directory and running firejail with the option --private-home=x, where x is the path to the icecat folder. --private-home only works with subdirectories of the home folder.