2 files changed, 17 insertions, 13 deletions
diff --git a/apps/mail/modules/mailMigrator.js b/apps/mail/modules/mailMigrator.js
index 645922227..151735221 100644
--- a/apps/mail/modules/mailMigrator.js
+++ b/apps/mail/modules/mailMigrator.js
@@ -102,7 +102,7 @@ var MailMigrator = {
   _migrateUI: function() {
     // The code for this was ported from
     // mozilla/browser/components/nsBrowserGlue.js
-    const UI_VERSION = 17;
+    const UI_VERSION = 19;
     const MESSENGER_DOCURL = "chrome://messenger/content/messenger.xul";
     const UI_VERSION_PREF = "mail.ui-rdf.version";
     let currentUIVersion = 0;
@@ -413,6 +413,11 @@ var MailMigrator = {
         Services.prefs.clearUserPref("layers.acceleration.force-enabled");
       }
 
+      if (currentUIVersion < 19) {
+        // Clear hardware decoding failure flag to re-test.
+        Services.prefs.clearUserPref("media.hardware-video-decoding.failed");
+      }
+
       // Update the migration version.
       Services.prefs.setIntPref(UI_VERSION_PREF, UI_VERSION);
 
diff --git a/apps/navigator/components/nsNavigatorGlue.js b/apps/navigator/components/nsNavigatorGlue.js
index a64e47394..19bbf8000 100644
--- a/apps/navigator/components/nsNavigatorGlue.js
+++ b/apps/navigator/components/nsNavigatorGlue.js
@@ -366,26 +366,25 @@ NavigatorGlue.prototype = {
 
   _migrateUI: function()
   {
-    const UI_VERSION = 8;
+    const PREF_REVISION = "app.ui.revision";
+    const UI_REVISION = 1;
 
-    // If the pref is not set this is a new or pre SeaMonkey 2.49 profile.
-    // We can't tell so we just run migration with version 0.
-    let currentUIVersion = 0;
+    let currentRevision = Services.prefs.getIntPref(PREF_REVISION, 0);
 
-    if (Services.prefs.prefHasUserValue("suite.migration.version")) {
-      currentUIVersion = Services.prefs.getIntPref("suite.migration.version");
+    if (currentRevision >= UI_REVISION) {
+      return;
     }
 
-    if (currentUIVersion >= UI_VERSION)
-      return;
+    if (currentRevision < 1) {
+      // Clear obsolete preference
+      Services.prefs.clearUserPref("suite.migration.version");
 
-    // Migration of disabled safebrowsing-phishing setting after pref renaming.
-    if (currentUIVersion < 8) {
-      // Shit to do
+      // Clear hardware decoding failure flag to re-test.
+      Services.prefs.clearUserPref("media.hardware-video-decoding.failed");
     }
 
     // Update the migration version.
-    Services.prefs.setIntPref("suite.migration.version", UI_VERSION);
+    Services.prefs.setIntPref(PREF_REVISION, UI_REVISION);
   },
 
   // Copies additional profile files from the default profile tho the current profile.