Bug 1275591 - Enable plugin content blocking by default

MozReview-Commit-ID: EfwrmYzPzXo

--HG--
extra : rebase_source : fea9f8fd9326b34a249f8333337da80318b034eb

modules/libpref/init/all.js

@@ -5123,7 +5123,7 @@ pref("browser.safebrowsing.reportPhishURL", "https://%LOCALE%.phish-report.mozil
 pref("browser.safebrowsing.reportMalwareMistakeURL", "https://%LOCALE%.malware-error.mozilla.com/?hl=%LOCALE%&url=");
 
 // The table and global pref for blocking plugin content
-pref("browser.safebrowsing.blockedURIs.enabled", false);
+pref("browser.safebrowsing.blockedURIs.enabled", true);
 pref("urlclassifier.blockedTable", "test-block-simple,mozplugin-block-digest256");
 
 // The protocol version we communicate with mozilla server.