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How can I use Firefox locally, preventing it from going online at all?

  • 12 回覆
  • 1 有這個問題
  • 12 次檢視
  • 最近回覆由 jlturriff

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For my own reasons, I want to use Firefox to view files that are local to my machine (file:///<filepath>) without connecting to the internet; but "Work Offline" seems to allow connections to go through.

I have searched for solutions on the web, but they either discuss blocking only certain resources or certain websites. That's not what I want; I want Firefox to stay completely offline when I'm working with my files.

Is there a way to do that?

所有回覆 (12)

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Press Alt or F10 to bring up the toolbar. Menu > File > OffLine

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No, that doesn't work. Even though the "Work Offline" option is checked (as it is right now as I send this response), Firefox still opens pages from the internet, e.g. this Mozilla Support page. I don't understand just what the "Work Offline" option does, but it certainly doesn't block Firefox from using an existing internet connection; perhaps it's intended to allow one to access local resources when there is no internet connection, but not to prevent access when there is one?

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That is strange. Open your Firewall. Find the Firefox entry and block it. Not remove, block.

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There are no rules in my iptables that mention Firefox.

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jlturriff said

No, that doesn't work. Even though the "Work Offline" option is checked (as it is right now as I send this response), Firefox still opens pages from the internet, e.g. this Mozilla Support page.

Opens any page? Even https://whatcanidoformozilla.org/ (don't click while online)?

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That's right, even that page opens while "Work Offline" is checked.

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Are you sure that the page isn't loaded from the cache?

Can you reload the page (Ctrl+R or Shift+Ctrl+R)?

Can you confirm that actually network traffic leaves the computer?

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I verified that "Work Offline" is in fact checked before I performed these checks.

"Are you sure that the page isn't loaded from the cache?" Yes. I cleared the cache, but even with "Work Offline" checked, pages load from the network.

"Can you reload the page (Ctrl+R or Shift+Ctrl+R)?" Yes. and I can see messages at the bottom of the window about connecting, waiting, etc.

"Can you confirm that actually network traffic leaves the computer?" Yes; according to your network monitor, traffic is moving across my network interface.

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Is your computer plugged into a phone line or are you using a modem/WiFi? You can unplug them for the same offline result until this issue is solved.

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I am using an Ethernet connection to connect via router to my satellite transceiver. To dis/reconnect the cable I will have to continually crawl around behind/under various pieces of furniture; not at all convenient.

I get the impression that Work Offline is not intended to enforce offlineness as much as to allow web apps to work while the network is unavailable, the opposite of what I am trying to do?

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OffLine means the browser should not connect to the outside world. I checked my Firefox (v54) and offline does work.

I also checked my v59.0.2 and offline works.

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The attachment shows what I'm running. It definitely does Not prevent connections to the outside world. Is it possible that there's something in about:config that could be related to this?