Today, while idly glancing at my expansive list of Firefox addons, I saw something called "Shield Recipe Client" that I do not remember installing - or even hearing about.

A quick web search gave me nothing useful - a few conversations about viruses that may or may not have had any relevance at all, a Mozilla wiki page that told me it was likely a thing but told me nothing about what it did, and some stuff in languages other than English - and I know useful search results are running out when I see languages other than English.

I attempted to disable the addon, but nothing happened. Going back to the addons list, it had disappeared entirely. Not a trace of it, disabled or not.

What is this thing? Is it still there? Should I start wearing a tinfoil hat and/or nuke the machine from orbit?


3 Answers 3


You should look at the links provided at the bottom of the Mozilla wiki page you cite. Seems like a Firefox "system addon" under development. Those addons are installed by Mozilla, and are not user-controllable. The Shield Recipe Client purpose appears to be to give Mozilla a further means of snooping around in your browser and performing actions, such as presenting survey questions, based on the results.

  • 2
    To be fair, they're not quite at the bottom of the page, and easy to miss if you've gone into skim-read mode. Nonetheless, I may have to invest in a tinfoil hat... May 4, 2017 at 11:28
  • To be fair, it seems to be using Telemetry to communicate with Mozilla - this functionality requires opt-in ("Share additional data" in preferences). You can see the studies this extension is currently supposed to perform under normandy.cdn.mozilla.net/api/v1/recipe. Jul 13, 2017 at 12:37
  • 1
    are not user-controllable, those are at least disableable via about:performance…
    – yckart
    Aug 4, 2017 at 10:07

Shield is a system that addresses user attrition and satisfaction in Firefox by providing a fast and powerful way for Firefox to interact with our users.

User-facing products powered by Shield include:

Shield Studies
Recruits users to participate in testing new features and ideas that help us validate product decisions. Our users tell us what to ship.

Gathers feedback from users for us to better understand what users find helpful and useful.


  • Can it be removed?
    – Quidam
    May 13, 2017 at 2:40
  • It can be disabled via typing about:config in the address bar and search for it
    – Ryan B
    May 17, 2017 at 22:38

Can it be removed?

Ccleaner > Tools > Browser Plugins

  • NOTE: this had to be an answer, I need 50 reputation to comment, I posted because I thought was very relevant.

Not the answer you're looking for? Browse other questions tagged or ask your own question.