More configuration for Firefox as suggested by Greg

lib/firefox/settings/firefoxPreferences.js

@@ -57,7 +57,7 @@ export const defaultFirefoxPreferences = {
   'security.turn_off_all_security_so_that_viruses_can_take_over_this_computer': true,
   'xpinstall.signatures.required': false,
   // Prevent Remote Settings to issue non local connections.
-  'services.settings.server': 'http://localhost/remote-settings-dummy/v1',
+  'services.settings.server': 'data:,#remote-settings-dummy/v1',
   // Ensure autoplay is enabled for all platforms.
   'media.autoplay.default': 0, // 0=Allowed, 1=Blocked, 2=Prompt
   'media.autoplay.enabled.user-gestures-needed': true,
@@ -198,5 +198,11 @@ export const defaultFirefoxPreferences = {
   'browser.newtabpage.activity-stream.showSponsoredTopSites': false,
   // See https://bugzilla.mozilla.org/show_bug.cgi?id=1930110
   // See https://github.com/sitespeedio/browsertime/issues/2211
-  'browser.search.serpEventTelemetryCategorization.enabled': false
+  'browser.search.serpEventTelemetryCategorization.enabled': false,
+  // Default Glean to "record but don't report" mode, and to never trigger
+  // activity-based ping submission. Docs:
+  // https://firefox-source-docs.mozilla.org/toolkit/components/glean/dev/preferences.html
+  'telemetry.fog.test.localhost_port': -1,
+  'telemetry.fog.test.activity_limit': -1,
+  'telemetry.fog.test.inactivity_limit': -1
 };