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Firefox still has it under File.

• teddyh 6y ago
  In the modern hamburger menu, it’s under “More”.
  • anonymfus 6y ago
    Ever if you have menu disabled, you can still open it by pressing Alt, no need to suffer using hamburger.
• runxel 6y ago
  Sure, but does it do anything?
  • nocman 6y ago
    Yes, it disables access to remote resources: https://support.mozilla.org/en-US/questions/1263417 https://support.mozilla.org/en-US/questions/1263417 So if you have a local web server (like on localhost), you'll still be able to access it, but you won't be able to access non-local IPs.