--- a/testing/profiles/prefs_general.js
+++ b/testing/profiles/prefs_general.js
@@ -292,16 +292,17 @@ user_pref("browser.translation.bing.tran
 user_pref("browser.translation.yandex.translateURLOverride", "http://%(server)s/browser/browser/components/translation/test/yandex.sjs");
 user_pref("browser.translation.engine", "bing");
 
 // Make sure we don't try to load snippets from the network.
 user_pref("browser.aboutHomeSnippets.updateUrl", "nonexistent://test");
 
 // Use an empty list of sites to avoid fetching
 user_pref("browser.newtabpage.activity-stream.default.sites", "");
+user_pref("browser.newtabpage.activity-stream.telemetry", false);
 
 // Don't fetch directory tiles data from real servers
 user_pref("browser.newtabpage.directory.source", 'data:application/json,{"testing":1}');
 
 // Ensure UITour won't hit the network
 user_pref("browser.uitour.pinnedTabUrl", "http://%(server)s/uitour-dummy/pinnedTab");
 user_pref("browser.uitour.url", "http://%(server)s/uitour-dummy/tour");
 

--- a/testing/talos/talos/config.py
+++ b/testing/talos/talos/config.py
@@ -92,16 +92,17 @@ DEFAULTS = dict(
         'network.proxy.http_port': 80,
         'network.proxy.type': 1,
         'security.enable_java': False,
         'security.fileuri.strict_origin_policy': False,
         'dom.send_after_paint_to_content': True,
         'security.turn_off_all_security_so_that_viruses_can_'
         'take_over_this_computer': True,
         'browser.newtabpage.activity-stream.default.sites': '',
+        'browser.newtabpage.activity-stream.telemetry': False,
         'browser.newtabpage.directory.source':
             '${webserver}/directoryLinks.json',
         'browser.newtabpage.introShown': True,
         'browser.safebrowsing.downloads.remote.url':
             'http://127.0.0.1/safebrowsing-dummy/downloads',
         'browser.safebrowsing.provider.google.gethashURL':
             'http://127.0.0.1/safebrowsing-dummy/gethash',
         'browser.safebrowsing.provider.google.updateURL':