SSL only firefox add-on?

[judaiko judaiko]

Let me say this first:

One company had a firewall that blocked all non SSL traffic.

So if you go https://mail.google.com and you sign in, it will stop you
at one URL which was not https.

I am not sure if Gmail still does this i.e. redirect you to non https
(http) url after login, and then again go into https mode when you
enter gmail.

So this firewall used to give error saying not allowed, but when you
changed it to https, the previous Gmail redirect url worked, and I
could login to Gmail.

Now is there an add-on that does this in Firefox?

Block ALL http traffic by default?

Then maybe like how Adblock plus is - "Disable on this page only"
allows http traffic only for that page?
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