The AI chatbox is about the browser.ml.chat.enabled pref. You can control all "browser." pref via policies.json. See the Preferences policy.

• https://mozilla.github.io/policy-templates/
• https://mozilla.github.io/policy-templates/#preferences

That doesn't seem to be working. I added "browser.ml.chat.enabled": false into my existing policies.json and restarted Firefox. The AI chatbot I had left open was still there, and going to the Firefox Labs section of settings still showed everything enabled as I had manually set it to test this out.

Is there another setting required to prevent it?

Did you look under the policies.json header of the Preferences to see what you need to add? It doesn't work like what you wrote: "browser.ml.chat.enabled": false There are likely errors reported in about:policies.

• https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson
• https://mozilla.github.io/policy-templates/

{
 "policies": {
    "Preferences": {
      "browser.ml.chat.enabled": {
        "Value": false,
        "Status": "user"
      }
    }
  }
}

Yeah, but I'm not seeing where it references ml.chat anywhere in any of the links, so guess I missed it.

Also, tried replacing the existing policies.json in the distribution folder with one just containing the above that you sent, but it still lets you turn on/off the "AI chatbot" option in Firefox Labs and still use the sidebar AI chat.

I do see the following now under Active in about:policies Preferences {"browser.ml.chat.enabled":{"Value":false,"Status":"user"}}

Replace "Status": "user" with "Status": "locked" if you do not want users be able to change this setting.