--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -103,65 +103,22 @@ pref("app.update.altwindowtype", "Browse
 pref("app.update.log", false);
 
 // The number of general background check failures to allow before notifying the
 // user of the failure. User initiated update checks always notify the user of
 // the failure.
 pref("app.update.backgroundMaxErrors", 10);
 
 // The aus update xml certificate checks for application update are disabled on
-// Windows and Mac OS X since the mar signature check are implemented on these
-// platforms and is sufficient to prevent us from applying a mar that is not
-// valid.
-#if defined(XP_WIN) || defined(XP_MACOSX)
+// Windows, Mac OS X, and Linux since the mar signature check are implemented on
+// these platforms and is sufficient to prevent us from applying a mar that is
+// not valid. Bug 1182352 will remove the update xml certificate checks and the
+// following two preferences.
 pref("app.update.cert.requireBuiltIn", false);
 pref("app.update.cert.checkAttributes", false);
-#else
-// When |app.update.cert.requireBuiltIn| is true or not specified the
-// final certificate and all certificates the connection is redirected to before
-// the final certificate for the url specified in the |app.update.url|
-// preference must be built-in.
-pref("app.update.cert.requireBuiltIn", true);
-
-// When |app.update.cert.checkAttributes| is true or not specified the
-// certificate attributes specified in the |app.update.certs.| preference branch
-// are checked against the certificate for the url specified by the
-// |app.update.url| preference.
-pref("app.update.cert.checkAttributes", true);
-
-// The number of certificate attribute check failures to allow for background
-// update checks before notifying the user of the failure. User initiated update
-// checks always notify the user of the certificate attribute check failure.
-pref("app.update.cert.maxErrors", 5);
-
-// The |app.update.certs.| preference branch contains branches that are
-// sequentially numbered starting at 1 that contain attribute name / value
-// pairs for the certificate used by the server that hosts the update xml file
-// as specified in the |app.update.url| preference. When these preferences are
-// present the following conditions apply for a successful update check:
-// 1. the uri scheme must be https
-// 2. the preference name must exist as an attribute name on the certificate and
-//    the value for the name must be the same as the value for the attribute name
-//    on the certificate.
-// If these conditions aren't met it will be treated the same as when there is
-// no update available. This validation will not be performed when the
-// |app.update.url.override| user preference has been set for testing updates or
-// when the |app.update.cert.checkAttributes| preference is set to false. Also,
-// the |app.update.url.override| preference should ONLY be used for testing.
-// IMPORTANT! media.gmp-manager.certs.* prefs should also be updated if these
-// are updated.
-
-// Non-release builds (Nightly, Aurora, etc.) have been switched over to aus4.mozilla.org.
-// This condition protects us against accidentally using it for release builds.
-pref("app.update.certs.1.issuerName", "CN=DigiCert Secure Server CA,O=DigiCert Inc,C=US");
-pref("app.update.certs.1.commonName", "aus4.mozilla.org");
-
-pref("app.update.certs.2.issuerName", "CN=Thawte SSL CA,O=\"Thawte, Inc.\",C=US");
-pref("app.update.certs.2.commonName", "aus4.mozilla.org");
-#endif
 
 // Whether or not app updates are enabled
 pref("app.update.enabled", true);
 
 // This preference turns on app.update.mode and allows automatic download and
 // install to take place. We use a separate boolean toggle for this to make
 // the UI easier to construct.
 pref("app.update.auto", true);