Should still be working.

• HTTPS Everywhere: http://www.eff.org/https-everywhere

It is up to the Extensions author on whether they want to host it at addons.mozilla.org or not. The majority hosted at a.m.o are third-party.

This is not a Plugin as that word is used for to refer to say Flash, Java, Quicktime etc.

You might try this extension as an alternative. https://addons.mozilla.org/en-US/firefox/addon/enforce-encryption/

Regardless of semantics - when I attempt to install HTTPS Everywhere to FF from the eff.org site, it says the add-on could not be downloaded because of a connection failure on eff.org. I never had this problem prior to FF 30 and it's no longer listed by Mozilla as an available add-on, plugin or whatever. There is not a connection failure issue because I am able to download it to IE or Chrome ( neither of which I like ) .

It seems that Mozilla has intentionally made this unavailable for it's latest version. Perhaps a symptom of selling out to 3rd parties which is paradoxical, considering the original open source privacy  philosophy behind the creation of Fire Fox. 

FF even demands full access to everything on a smart phone ( camera, mic, SD card, texts, contacts etc... It used to be a browser designed to protect privacy. I guess greed always trumps ethos in the end

Thanks for the suggestion, but I stand behind HTTPS Everywhere, both in the practicality of the extension and their conviction to a cause. Something Mozilla is losing sight of.

Mozilla isn't blocking any websites. What's the exact error it's giving you when you try to download it?

Just because you are having an issue in installing it directly from the eff site does not mean it must be some conspiracy preventing Firefox users from using this extension. You can always save the this .xpi file to disk and install it in Firefox from disk.

Either drag and drop it onto a Firefox window or File->Open File Ctrl+O and browse to file and open to install.

As for last comment about the Android version. https://support.mozilla.org/en-US/kb/how-firefox-android-use-permissions-it-requests

When I click the FF download link it says: add-on could not be downloaded because of a connection failure on www.eff.org.

The EFF tried sending me a direct link and it says the same thing except w/ connection failure to : and it lists my e mail provider.

I never claimed it was a conspiracy preventing my ability to download it from the EFF site. I did however question why such an essential extension was removed from the Add-ons library. There was a similar issue where No Script was removed, in a prior FF upgrade, as an extension. It was still available via about: config - just kind of strange that it was removed. That has since become available again as an extension though.

I will try your suggestion.

I do still think FF is the best and most private browser. Regarding the Android permissions, it still seems to leave some vulnerabilities. Perhaps I'm just a skeptic but I'm sure Google can rationalize all of their android app ubiquitous permissions as well. It doesn't make me feel particularly secure though. I plan to go w/ root access.

https://www.eff.org/https-everywhere

Right-click the download link and use Save Link As .... Then drag the xpi file into the Firefox window to install it. Or use File > Open File ... to install it.

I did however question why such an essential extension was removed from the Add-ons library.

Mozilla didn't remove it, EFF did. It used to be because Mozilla's privacy policy wasn't restrictive enough, but now EFF saying that they'll add it sometime. https://lists.eff.org/pipermail/https-everywhere/2014-April/002050.html

If you cannot download the .xpi file for Firefox using the method listed by the-edmeister in this post, try downloading it using one of your other browsers, and then dragging it onto an open Firefox tab.

In your original post, you referred to Tor. Are you using Tor in all of your browsers, or only in Firefox? That could be one cause for the difference, if a firewall on EFF's server is detecting your connection source differently due to Tor or another proxy.

No, Im not using Tor on the same computer so that isn't related. EFF sent me the xpi as an email attachment. I was able to download it, then install it as a FF extension. Using another browser to download it and drag to FF would likely have worked also.

Thats interesting that EFF removed it due to FF not having a restrictive privacy policy. I guess they were just making a statement since it has to be attached to some browser. With the exception of Tor ( which is branch of FF ? ) there are no privacy minded browsers that I'm aware of.

Just a note about Tor: Tor is not a Mozilla product, but it uses some of the code that Mozilla makes available to others under an open source software license.