Thank you "xenopeek" for providing that web link to the "Firejail" "sandbox" program. I'm looking forward to your tutorial on this.
I went to that "Firejail" website and downloaded the "Firejail" and "Firetools" installation programs (32-bit ".deb" for my Linux Mint & for my current computer(s), others users might need 64-bit), and just double clicked the "Firejail" ".deb" file I saved to install it, then I double clicked the "Firetools" ".deb" file to install that too, easy. Then, I ran the Firetools program from my menu which automatically had my FireFox browser in there. I did not have to setup anything for FireFox. So, I clicked Firefox from the Firetools launcher (panel), and I'm running a more secure FireFox browser right now to do this. Firejail (& firetools) doesn't seem to slow my system down either, nor does it take up much Ram memory either 9632 KB.
Although Linux and Linux Mint are far more secure than Ms Windows, or Macs, it could be possible for some bad people or their malware program creations to access your system through your browser; extremely rare, but possible. Using a "SandBox" type program will prevent those "bad" people and their "bad" programs from accessing anything else in your system.
Firejail is a sandbox program that reduces the risk of security breaches by restricting the running environment of untrusted applications, or any application(s)
Sandbox (computer security)https://en.wikipedia.org/wiki/Sandbox_%28computer_security%29
Thanks again ...