diff --git a/extension/background.js b/extension/background.js
index 2cf696b..00c2cf3 100644
--- a/extension/background.js
+++ b/extension/background.js
@@ -1,13 +1,119 @@
 var browser = browser || chrome;
 
+var PENDING_SUBMISSIONS = ':PENDING_SUBMISSIONS'
+var MIGRATION = ':MIGRATION'
+
+var badIdentifiersArray = [
+    'archive.is',
+    'archive.org',
+    'assets.tumblr.com',
+    'bit.ly',
+    'blogspot.com',
+    'facebook.com/a',
+    'facebook.com/ad_campaign',
+    'facebook.com/ads',
+    'facebook.com/ajax',
+    'facebook.com/bookmarks',
+    'facebook.com/buddylist.php',
+    'facebook.com/bugnub',
+    'facebook.com/comment',
+    'facebook.com/composer',
+    'facebook.com/events',
+    'facebook.com/findfriends',
+    'facebook.com/friends',
+    'facebook.com/fundraisers',
+    'facebook.com/games',
+    'facebook.com/groups',
+    'facebook.com/help',
+    'facebook.com/home.php',
+    'facebook.com/intl',
+    'facebook.com/jobs',
+    'facebook.com/l.php',
+    'facebook.com/language.php',
+    'facebook.com/legal',
+    'facebook.com/like.php',
+    'facebook.com/local_surface',
+    'facebook.com/logout.php',
+    'facebook.com/mbasic',
+    'facebook.com/menu',
+    'facebook.com/messages',
+    'facebook.com/nfx',
+    'facebook.com/notes',
+    'facebook.com/notifications.php',
+    'facebook.com/notifications',
+    'facebook.com/nt',
+    'facebook.com/page',
+    'facebook.com/pages',
+    'facebook.com/people',
+    'facebook.com/permalink.php',
+    'facebook.com/pg',
+    'facebook.com/photo.php',
+    'facebook.com/policies',
+    'facebook.com/privacy',
+    'facebook.com/profile.php',
+    'facebook.com/rapid_report',
+    'facebook.com/reactions',
+    'facebook.com/salegroups',
+    'facebook.com/search',
+    'facebook.com/settings',
+    'facebook.com/shares',
+    'facebook.com/story.php',
+    'facebook.com/ufi',
+    'media.tumblr.com',
+    'medium.com',
+    'reddit.com',
+    'reddit.com/r/all',
+    'reddit.com/r/popular',
+    'removeddit.com',
+    't.co',
+    't.umblr.com',
+    'tumblr.com',
+    'twitter.com',
+    'twitter.com/hashtag',
+    'twitter.com/i',
+    'twitter.com/search',
+    'twitter.com/settings',
+    'twitter.com/threadreaderapp',
+    'twitter.com/who_to_follow',
+    'wordpress.com',
+    'www.tumblr.com',
+    'youtu.be',
+    'youtube.com',
+    'youtube.com/redirect',
+    'youtube.com/watch',
+];
+var badIdentifiers = {};
+badIdentifiersArray.forEach(x => badIdentifiers[x] = true);
+
 
 var overrides = null;
 
 var accepted = false;
 var installationId = null;
+
 browser.storage.local.get(['overrides', 'accepted', 'installationId'], v => {
     accepted = v.accepted
     overrides = v.overrides || {}
+
+    var migration = overrides[MIGRATION] || 0;
+    var CURRENT_VERSION = 2;
+    if(migration < CURRENT_VERSION){
+
+        for(var key of Object.getOwnPropertyNames(overrides)){
+            if(key.startsWith(':')) continue;
+            if(key != key.toLowerCase()){
+                var v = overrides[key];
+                delete overrides[key];
+                overrides[key.toLowerCase()] = v;
+            }
+        }
+        
+        badIdentifiersArray.forEach(x => delete overrides[x]);
+
+        overrides[MIGRATION] = CURRENT_VERSION;
+        browser.storage.local.set({ overrides: overrides });
+    }
+    
     if (!v.installationId) {
         installationId = (Math.random() + '.' + Math.random() + '.' + Math.random()).replace(/\./g, '');
         browser.storage.local.set({ installationId: installationId });
@@ -121,8 +227,6 @@ function submitPendingRatings() {
 }
 
 
-var PENDING_SUBMISSIONS = ':PENDING_SUBMISSIONS'
-
 function saveLabel(response) {
     if (accepted) {
         if (!overrides[PENDING_SUBMISSIONS]) {
@@ -148,69 +252,6 @@ function openHelp() {
     })
 }
 
-var badIdentifiers = {};
-[
-    'facebook.com/a',
-    'facebook.com/ad_campaign',
-    'facebook.com/ads',
-    'facebook.com/ajax',
-    'facebook.com/bookmarks',
-    'facebook.com/buddylist.php',
-    'facebook.com/bugnub',
-    'facebook.com/comment',
-    'facebook.com/composer',
-    'facebook.com/events',
-    'facebook.com/findfriends',
-    'facebook.com/friends',
-    'facebook.com/fundraisers',
-    'facebook.com/games',
-    'facebook.com/groups',
-    'facebook.com/help',
-    'facebook.com/home.php',
-    'facebook.com/intl',
-    'facebook.com/jobs',
-    'facebook.com/l.php',
-    'facebook.com/language.php',
-    'facebook.com/legal',
-    'facebook.com/like.php',
-    'facebook.com/local_surface',
-    'facebook.com/logout.php',
-    'facebook.com/mbasic',
-    'facebook.com/menu',
-    'facebook.com/messages',
-    'facebook.com/nfx',
-    'facebook.com/notes',
-    'facebook.com/notifications.php',
-    'facebook.com/notifications',
-    'facebook.com/nt',
-    'facebook.com/page',
-    'facebook.com/pages',
-    'facebook.com/people',
-    'facebook.com/permalink.php',
-    'facebook.com/pg',
-    'facebook.com/photo.php',
-    'facebook.com/policies',
-    'facebook.com/privacy',
-    'facebook.com/profile.php',
-    'facebook.com/rapid_report',
-    'facebook.com/reactions',
-    'facebook.com/salegroups',
-    'facebook.com/search',
-    'facebook.com/settings',
-    'facebook.com/shares',
-    'facebook.com/story.php',
-    'facebook.com/ufi',
-    'reddit.com/r/all',
-    'reddit.com/r/popular',
-    'twitter.com/hashtag',
-    'twitter.com/i',
-    'twitter.com/search',
-    'twitter.com/settings',
-    'twitter.com/threadreaderapp',
-    'twitter.com/who_to_follow',
-    'youtube.com/watch',
-].forEach(x => badIdentifiers[x] = true);
-
 
 
 browser.contextMenus.onClicked.addListener(function (info, tab) {
diff --git a/extension/content.js b/extension/content.js
index 30a4d08..66d4cae 100644
--- a/extension/content.js
+++ b/extension/content.js
@@ -308,7 +308,7 @@ function getIdentifier(urlstr) {
     try {
         var k = getIdentifierInternal(urlstr);
         if (k && k.indexOf('!') != -1) return null;
-        return k;
+        return k.toLowerCase();
     } catch (e) {
         console.warn("Unable to get identifier for " + urlstr);
         return null;
@@ -408,10 +408,10 @@ function getIdentifierInternal(urlstr) {
     if (isHostedOn(host, 'reddit.com')) {
         var pathname = url.pathname.replace('/u/', '/user/');
         if (!pathname.startsWith('/user/') && !pathname.startsWith('/r/')) return null;
-        return 'reddit.com' + takeFirstPathComponents(pathname, 2).toLowerCase();
+        return 'reddit.com' + takeFirstPathComponents(pathname, 2);
     }
     if (isHostedOn(host, 'twitter.com')) {
-        return 'twitter.com' + takeFirstPathComponents(url.pathname, 1).toLowerCase();
+        return 'twitter.com' + takeFirstPathComponents(url.pathname, 1);
     }
     if (isHostedOn(host, 'youtube.com')) {
         var pathname = url.pathname;
@@ -422,7 +422,7 @@ function getIdentifierInternal(urlstr) {
         return 'disqus.com' + takeFirstPathComponents(url.pathname, 2);
     }
     if (isHostedOn(host, 'medium.com')) {
-        return 'medium.com' + takeFirstPathComponents(url.pathname, 1).toLowerCase();
+        return 'medium.com' + takeFirstPathComponents(url.pathname, 1);
     }
     if (isHostedOn(host, 'tumblr.com')) {
         if (url.pathname.startsWith('/register/follow/')) {
@@ -430,7 +430,7 @@ function getIdentifierInternal(urlstr) {
             return name ? name + '.tumblr.com' : null;
         }
         if (host != 'www.tumblr.com' && host != 'assets.tumblr.com' && host.indexOf('.media.') == -1) {
-            if (!url.pathname.startsWith('/tagged/')) return url.host.toLowerCase();
+            if (!url.pathname.startsWith('/tagged/')) return url.host;
         }
         return null;
     }
@@ -441,13 +441,13 @@ function getIdentifierInternal(urlstr) {
     }
     if (host.indexOf('.blogspot.') != -1) {
         var m = captureRegex(host, /([a-zA-Z0-9\-]*)\.blogspot/);
-        if (m) return m.toLowerCase() + '.blogspot.com';
+        if (m) return m + '.blogspot.com';
     }
 
     var id = host;
     if (id.startsWith('www.')) id = id.substr(4);
     if (id.startsWith('m.')) id = id.substr(2);
-    return id.toLowerCase();
+    return id;
 }