This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Why Firefox sandbox is not active?

lucarioruben
lucarioruben
more options

I have tried to change sandbox level in firefox in about:config, but it doesn´t matter what level I set, I still have access to system files from the browser "file://" page, so that means that my files are exposed and sandbox it´s not restricting anything, right?. How could I solve it?. If I execute firefox with firejail the program crashes. I tried with Tor and the sandbox is working, so is not a problem with my OS, could I use the same configuration that Tor uses in firefox with some trick?. I´m in Linux Manjaro 4.19

I have tried to change sandbox level in firefox in about:config, but it doesn´t matter what level I set, I still have access to system files from the browser "file://" page, so that means that my files are exposed and sandbox it´s not restricting anything, right?. How could I solve it?. If I execute firefox with firejail the program crashes. I tried with Tor and the sandbox is working, so is not a problem with my OS, could I use the same configuration that Tor uses in firefox with some trick?. I´m in Linux Manjaro 4.19

All Replies (2)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
more options

This page describes what the different sandbox levels are supposed to do: https://wiki.mozilla.org/Security/Sandbox#Linux

What is the browser file:// page -- do you mean a directory listing or full path accessed from the address bar?

I should note that what you can access through the address bar isn't necessarily the same as what web content can access. However, I don't know the best way to test that.

Regarding Tor and opening local files, perhaps there is some unique code in Tor related to local files (other than sandbox)?

lucarioruben
lucarioruben Mwenye swali
more options

I mean the full path from the address bar. Actually, I was looking for a way to test that, I know that in Tor I can´t access some files which I can in Firefox (I think that Tor have a different sandbox system, but I´m not sure), but that´s not enough to know if Firefox is totally safe, I just know that PROBABLY, is not as safe as Tor regarding sandboxing.