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I want to avoid accidentally visiting websites served over unencrypted HTTP.

How can I configure Firefox so that it will warn me if I attempt to visit such a site?

Ideally:

  • this shouldn't need an add-on, but if that's the only way you can find to achieve it, then please explain that approach.
  • the warning will be similar to that which Firefox gives if I attempt to visit a site, served over HTTPS, whose certificate has expired or is otherwise untrusted, i.e. hard to miss!
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  • HTTPS Everywhere is a great add-on, but it does not do what I asked for in my question. It does something quite different, which is to ensure that requests are made over HTTPS where the EFF knows HTTPS to be available.
    – user11574
    Aug 25, 2015 at 19:11
  • Didn't mean to sound harsh, but it wasn't a very helpful comment. "How can I do X?" "Here's how to do Y." Thanks for trying, though: I appreciate the good intention. Ideally, I would like to avoid writing an entire add-on: if I wanted to do that, I'd have asked at StackOverflow or similar :)
    – user11574
    Aug 25, 2015 at 19:26
  • Fine; I will delete my comment; This can only be done with an add-on
    – Ramhound
    Aug 25, 2015 at 19:31
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    That would make your question off-topic, so surely, that's not what you're asking.
    – fixer1234
    Aug 26, 2015 at 1:48
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    You misunderstood my comment. I think your question is fine as-is. However, explicitly asking for a software recommendation would make it off topic (and someone already voted to close on that basis). I was suggesting that you not advertize that a software rec was the intent of your question. There is nothing wrong with people recommending software as a solution, though. Maybe I should have ended my tongue-in-cheek comment with a smilely face. :-)
    – fixer1234
    Aug 26, 2015 at 2:50

1 Answer 1

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Install the uBlock Origin add-on.

Go to the uBlock Origin dashboard and click on the "My filters" tab.

(Alternatively, paste this into FireFox's address bar and then hit enter: chrome://ublock0/content/dashboard.html#1p-filters.html .)

Add the following rule on a line by itself

http://*

Click the "Apply changes" button. Done!

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