diff --git a/hosts/common/programs/firefox/user.js b/hosts/common/programs/firefox/user.js
index e992f061c..760b8de20 100644
--- a/hosts/common/programs/firefox/user.js
+++ b/hosts/common/programs/firefox/user.js
@@ -143,9 +143,20 @@ defaultPref("browser.shell.checkDefaultBrowser", false);
 // disable extension updates
 defaultPref("extensions.update.autoUpdateDefault", false);
 defaultPref("extensions.update.enabled", false);
+defaultPref("extensions.systemAddon.update.enabled", false);
 // wipe the URIs used to check for updates, as a precaution.
 defaultPref("extensions.update.url", "");
 defaultPref("extensions.update.background.url", "");
+defaultPref("extensions.systemAddon.update.url", "");
+
+// also disable app-level auto-updates
+defaultPref("app.update.auto", false);
+
+// disable "safe browsing", in which my browser asks Google whether a site is malicious or not, for every site i visit (?)
+defaultPref("browser.safebrowsing.blockedURIs.enabled", false);
+defaultPref("browser.safebrowsing.downloads.enabled", false);
+defaultPref("browser.safebrowsing.malware.enabled", false);
+defaultPref("browser.safebrowsing.phishing.enabled", false);
 
 // browser.engagement.sidebar-button.has-used
 // browser.migration.version = 150