[Privacy] Disable transmission of the referer header in Firefox

You know what the HTTP referer(yes, it is misspelled) header is, right?

It contains the website which you have used to arrive to a specific website/webserver.

Let’s exemplify this:

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Running multiple Firefox instances at the same time

Well, why would you want to do this? Basically, you can use Firefox instances that are of different versions or maybe even with different profiles.

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