about:studies in the Address Bar then Enter it should be listed on this page and there should be a way to uninstall/remove or to opt out.

You are running a unsupported browser with un-patched security risks.

52.5.0 ESR is supported. It will continue to get security updates until May 2018, and you can download and install it from this page: https://www.mozilla.org/en-US/firefox/organizations/all/ Note : Legacy Extensions will be deleted or removed in any version update after May 2018.

You should make a backup of your Profile before going back and just because: https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Please let us know if this solved your issue or if need further assistance.

Thanks for the suggestion.

about:studies tells me address isn't valid. I am upgrading my FF one click at a time til I determine where my other issue is coming from. If I jump too many versions at once I encounter problems with sites not keeping me logged in.

This is why you need to keep up-to-date. Sometimes certain about: pages are available on specific versions.

Anyway, this pref controls the SHIELD program. extensions.shield-recipe-client.enabled to false.

In the past when I kept as up to date as possible I often then had issues such as broken plug ins. Some plug ins were irreplaceable and required time for the dev to update. I just replaced with 55.0.3 to see how stable things run. I held back for some time because anonymox had to working substitute. Now I am moving forward.

I'm on 55.0.3 and don't want to update to 57 because crucial extensions are not supported. I thought I had disabled Heartbeat, but I keep getting this nag bar on top:

https://support.cdn.mozilla.net/media/uploads/images/2017-12-04-06-21-00-acd03a.png

about:studies as suggested earlier gives "The address isn’t valid".

I don't like my software calling home for ANY reason. I prefer to be in control myself. How did my browser learn that it was "critically out of date"??

And how can I turn that off?

To Illa

See the Rate your Firefox experience, surveys and out of date messages (Heartbeat) article (and the reply by moses in this thread dated 11/24/17) . The preference to disable heartbeat via about:config has changed. In Firefox 55 and above, the NEW preference is: extensions.shield-recipe-client.enabled which you would set to false.

See also Mozilla Support rules and guidelines under posting support requests. If you need more help please ask a new question since this thread is for helping Misterkrawk.

Misterkrawk said

Recently updated to 55.0.2, there's a new nag screen called Hearthbeat/Shield and doing a search on how to get rid of it yields the wrong answer. Answer says:
open about:config
set browser.selfsupport.url to ""
enjoy the rest of your day!

However, once I am in the config screen, I search browser.se (as soon as I hit the letter l, the screen goes blank with no choices) Can we try again please?

For the record, the Mozilla Wiki page you likely found via search, https://wiki.mozilla.org/Firefox/Shield/Heartbeat ... now says the following:

Disabling Heartbeat

We understand that any interruption of your time on the internet can be annoying.

1. open about:config 2. toggle extensions.shield-recipe-client.enabled to false 3. enjoy the rest of your day!