diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 0687a578ddab..ad72605e322f 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1230,6 +1230,9 @@ pref("social.toast-notifications.enabled", true);
 
 pref("dom.identity.enabled", false);
 
+// Turn on the CSP 1.0 parser for Content Security Policy headers
+pref("security.csp.speccompliant", true);
+
 // Block insecure active content on https pages
 pref("security.mixed_content.block_active_content", true);