4 files changed, 13 insertions, 35 deletions
diff --git a/toolkit/modules/NewTabUtils.jsm b/toolkit/modules/NewTabUtils.jsm
index 548d87dda..35e38156f 100644
--- a/toolkit/modules/NewTabUtils.jsm
+++ b/toolkit/modules/NewTabUtils.jsm
@@ -119,18 +119,14 @@ LinksStorage.prototype = {
 
   get _storedVersion() {
     if (this.__storedVersion === undefined) {
-      try {
-        this.__storedVersion =
-          Services.prefs.getIntPref("browser.newtabpage.storageVersion");
-      } catch (ex) {
-        // The storage version is unknown, so either:
-        // - it's a new profile
-        // - it's a profile where versioning information got lost
-        // In this case we still run through all of the valid migrations,
-        // starting from 1, as if it was a downgrade.  As previously stated the
-        // migrations should already support running on an updated store.
-        this.__storedVersion = 1;
-      }
+      // The storage version is unknown, so either:
+      // - it's a new profile
+      // - it's a profile where versioning information got lost
+      // In this case we still run through all of the valid migrations,
+      // starting from 1, as if it was a downgrade.  As previously stated the
+      // migrations should already support running on an updated store.
+      this.__storedVersion =
+        Services.prefs.getIntPref("browser.newtabpage.storageVersion", 1);
     }
     return this.__storedVersion;
   },
diff --git a/toolkit/modules/PermissionsUtils.jsm b/toolkit/modules/PermissionsUtils.jsm
index dfed76f0c..4bf43a3ec 100644
--- a/toolkit/modules/PermissionsUtils.jsm
+++ b/toolkit/modules/PermissionsUtils.jsm
@@ -16,10 +16,7 @@ function importPrefBranch(aPrefBranch, aPermission, aAction) {
   let list = Services.prefs.getChildList(aPrefBranch, {});
 
   for (let pref of list) {
-    let origins = "";
-    try {
-      origins = Services.prefs.getCharPref(pref);
-    } catch (e) {}
+    let origins = Services.prefs.getCharPref(pref, "");
 
     if (!origins)
       continue;
diff --git a/toolkit/modules/UpdateUtils.jsm b/toolkit/modules/UpdateUtils.jsm
index e92b1b797..fed7c7637 100644
--- a/toolkit/modules/UpdateUtils.jsm
+++ b/toolkit/modules/UpdateUtils.jsm
@@ -31,13 +31,9 @@ this.UpdateUtils = {
    *        Whether or not to include the partner bits. Default: true.
    */
   getUpdateChannel(aIncludePartners = true) {
-    let channel = AppConstants.MOZ_UPDATE_CHANNEL;
+    let channel = defaults.getCharPref("app.update.channel",
+                                       AppConstants.MOZ_UPDATE_CHANNEL);
     let defaults = Services.prefs.getDefaultBranch(null);
-    try {
-      channel = defaults.getCharPref("app.update.channel");
-    } catch (e) {
-      // use default value when pref not found
-    }
 
     if (aIncludePartners) {
       try {
@@ -93,15 +89,7 @@ this.UpdateUtils = {
 
 /* Get the distribution pref values, from defaults only */
 function getDistributionPrefValue(aPrefName) {
-  var prefValue = "default";
-
-  try {
-    prefValue = Services.prefs.getDefaultBranch(null).getCharPref(aPrefName);
-  } catch (e) {
-    // use default when pref not found
-  }
-
-  return prefValue;
+  return prefValue = Services.prefs.getDefaultBranch(null).getCharPref(aPrefName, "default");
 }
 
 /**
diff --git a/toolkit/modules/secondscreen/SimpleServiceDiscovery.jsm b/toolkit/modules/secondscreen/SimpleServiceDiscovery.jsm
index cf9617ea1..4abc93ad1 100644
--- a/toolkit/modules/secondscreen/SimpleServiceDiscovery.jsm
+++ b/toolkit/modules/secondscreen/SimpleServiceDiscovery.jsm
@@ -186,10 +186,7 @@ var SimpleServiceDiscovery = {
   },
 
   _searchFixedDevices: function _searchFixedDevices() {
-    let fixedDevices = null;
-    try {
-      fixedDevices = Services.prefs.getCharPref("browser.casting.fixedDevices");
-    } catch (e) {}
+    let fixedDevices = Services.prefs.getCharPref("browser.casting.fixedDevices", "");
 
     if (!fixedDevices) {
       return;