Bug 1847772 - aec logging button in about:webrtc is more helpful when sandboxed;r=mjf,fluent-reviewers,flod

Differential Revision: https://phabricator.services.mozilla.com/D185684

toolkit/content/aboutwebrtc/aboutWebrtc.mjs

@@ -302,7 +302,11 @@ class AecLogging extends Control {
   }
 
   onClick() {
-    this.setState((WGI.aecDebug = !WGI.aecDebug));
+    if (Services.env.get("MOZ_DISABLE_CONTENT_SANDBOX") != "1") {
+      this.message = "about-webrtc-aec-logging-unavailable-sandbox";
+    } else {
+      this.setState((WGI.aecDebug = !WGI.aecDebug));
+    }
     this.update();
   }
 }

toolkit/locales/en-US/toolkit/about/aboutWebrtc.ftl

@@ -23,6 +23,7 @@ about-webrtc-aec-logging-msg-label = AEC Logging
 about-webrtc-aec-logging-off-state-label = Start AEC Logging
 about-webrtc-aec-logging-on-state-label = Stop AEC Logging
 about-webrtc-aec-logging-toggled-on-state-msg = AEC logging active (speak with the caller for a few minutes and then stop the capture)
+about-webrtc-aec-logging-unavailable-sandbox = The environment variable MOZ_DISABLE_CONTENT_SANDBOX=1 is required to export AEC logs. Only set this variable if you understand the possible risks.
 # Variables:
 #  $path (String) - The path to which the aec log file is saved.
 about-webrtc-aec-logging-toggled-off-state-msg = Captured log files can be found in: { $path }