--- a/README
+++ b/README
@@ -18,8 +18,10 @@ v20120430.01 - Bug 741004 - A hotfix rol
                communicate the de-support of Windows 2000 and XP <= SP1 in Firefox 13.
 v20120817.01 - Bug 774509 - A hotfix rolled out to 16.* OS X users to
                communicate the de-support of Mac OS X 10.5 in Firefox 17.
 v20120910.01 - Bug 790096 - Disable staged updates on OS X and Linux for
                15.0a1 - 18.0a1. The flipped pref name will be renamed in fixed builds.
 v20121019.01 - Bug 803596 - Combines the previous two hotfixes and also updates
                the hotfix certificate fingerprint to accept a new certificate
 v20121128.01 - Bug 816197 - Notify Firefox 17 users affected by Tab Mix Plus issues.
+v20130211.01 - Bug 839239 - Disable pdf.js for Firefox 18 and 19 users in the 'release'
+               channel in all platforms.

copy from v20120910.01/bootstrap.js
copy to v20130211.01/bootstrap.js
--- a/v20120910.01/bootstrap.js
+++ b/v20130211.01/bootstrap.js
@@ -2,17 +2,23 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
 
 Cu.import("resource://gre/modules/AddonManager.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 
-const APP_UPDATE_STAGE_ENABLED_PREF = "app.update.stage.enabled";
+const PDFJS_DISABLED_PREF = "pdfjs.disabled";
+const PDFJS_BEFOREHOTFIX_DISABLED_PREF = "pdfjs.beforeHotfix.disabled";
+const PREVIOUS_ACTION_PREF = "pdfjs.previousHandler.preferredAction";
+const PREVIOUS_ASK_PREF = "pdfjs.previousHandler.alwaysAskBeforeHandling";
+const DISABLED_PLUGIN_TYPES_PREF = "plugin.disable_full_page_plugin_for_types";
+const PDF_CONTENT_TYPE = "application/pdf";
+const UPDATE_CHANNEL_PREF = "app.update.channel";
 
 function install(data, reason) {
   if (!shouldHotfixApp()) {
     uninstallHotfix(data);
     return;
   }
 
   AddonManager.getAddonByID(data.id, function(addon) {
@@ -23,18 +29,49 @@ function install(data, reason) {
 
 function startup(data, reason) {
   if (!shouldHotfixApp()) {
     uninstallHotfix(data);
     return;
   }
 
   try {
-    Services.prefs.setBoolPref(APP_UPDATE_STAGE_ENABLED_PREF, false);
+    let prevDisabled = Services.prefs.getBoolPref(PDFJS_DISABLED_PREF);
+
+    // Disable pdf.js and store previous user choice for when we later re-enable it.
+    Services.prefs.setBoolPref(PDFJS_DISABLED_PREF, true);
+    Services.prefs.setBoolPref(PDFJS_BEFOREHOTFIX_DISABLED_PREF, prevDisabled);
+
+    // Remove the pdf content type from the blacklist of full-page plugins for types.
+    if (Services.prefs.getPrefType(DISABLED_PLUGIN_TYPES_PREF) == Services.prefs.PREF_STRING) {
+      let disabledTypes = Services.prefs.getCharPref(DISABLED_PLUGIN_TYPES_PREF)
+                            .split(",")
+                            .filter(function (type) type != PDF_CONTENT_TYPE)
+                            .join(",");
+      Services.prefs.setCharPref(DISABLED_PLUGIN_TYPES_PREF, disabledTypes);
+    }
+
+    // Ensure the pref changes are written to disk.
     Services.prefs.savePrefFile(null);
+
+    // Restore previous pdf handler information before pdf.js was enabled.
+    let mimeSvc = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+    let mimeHandler = mimeSvc.getFromTypeAndExtension(PDF_CONTENT_TYPE, "pdf");
+
+    if (Services.prefs.getPrefType(PREVIOUS_ACTION_PREF) == Services.prefs.PREF_INT) {
+      mimeHandler.preferredAction = Services.prefs.getIntPref(PREVIOUS_ACTION_PREF);
+    }
+
+    if (Services.prefs.getPrefType(PREVIOUS_ASK_PREF) ==  Services.prefs.PREF_BOOL) {
+      mimeHandler.alwaysAskBeforeHandling = Services.prefs.getBoolPref(PREVIOUS_ASK_PREF);
+    }
+
+    let handlerSvc = Cc['@mozilla.org/uriloader/handler-service;1']
+                       .getService(Ci.nsIHandlerService);
+    handlerSvc.store(mimeHandler);
   } catch (ex) {
     Cu.reportError(ex);
   }
 
   // This hotfix should always be uninstalled.
   uninstallHotfix(data);
 }
 
@@ -42,43 +79,30 @@ function shutdown(data, reason) { }
 
 function uninstall(data, reason) { }
 
 /**
  * @return boolean whether the hotfix applies to the application.
  */
 function shouldHotfixApp() {
   // Ensure that this is the correct version in case compatability checking is overridden.
-  if (Services.vc.compare(Services.appinfo.version, "15.0a1") < 0 ||
-      Services.vc.compare(Services.appinfo.version, "18.0a1") > 0) {
-    return false;
-  }
-
-  let defaultPrefs = Services.prefs.getDefaultBranch("");
-  let isESR = false;
-  try {
-    isESR = defaultPrefs.getCharPref("app.update.channel") == "esr";
-  } catch (e) { }
-
-  if (isESR) {
-    return false;
-  }
-
-  if (Services.appinfo.OS !== "Linux" && Services.appinfo.OS !== "Darwin") {
+  if (Services.vc.compare(Services.appinfo.version, "18.0") < 0 ||
+      Services.vc.compare(Services.appinfo.version, "19.0.*") > 0 ||
+      (Services.prefs.getPrefType(UPDATE_CHANNEL_PREF) == Services.prefs.PREF_STRING &&
+       Services.prefs.getCharPref(UPDATE_CHANNEL_PREF) != "release")) {
     return false;
   }
 
   try {
-    if (Services.prefs.getBoolPref(APP_UPDATE_STAGE_ENABLED_PREF) === false) {
+    if (Services.prefs.getPrefType(PDFJS_BEFOREHOTFIX_DISABLED_PREF) ==
+        Services.prefs.PREF_BOOL) {
+      // This hotfix has already been used.
       return false;
     }
-  } catch (ex) {
-    // Pref does not exist so this is not an affected build.
-    return false;
-  }
+  } catch (ex) { }
 
   return true;
 }
 
 function uninstallHotfix(data) {
   AddonManager.getAddonByID(data.id, function(addon) {
     addon.uninstall();
   });

copy from v20120910.01/chrome.manifest
copy to v20130211.01/chrome.manifest

copy from v20120910.01/icon.png
copy to v20130211.01/icon.png

copy from v20120910.01/icon64.png
copy to v20130211.01/icon64.png

copy from v20120910.01/install.rdf
copy to v20130211.01/install.rdf
--- a/v20120910.01/install.rdf
+++ b/v20130211.01/install.rdf
@@ -1,29 +1,27 @@
 <?xml version="1.0"?>
 
 <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:em="http://www.mozilla.org/2004/em-rdf#">
 
   <Description about="urn:mozilla:install-manifest">
     <em:id>firefox-hotfix@mozilla.org</em:id>
-    <em:version>20120910.01</em:version>
+    <em:version>20130211.01</em:version>
     <em:bootstrap>true</em:bootstrap>
-    <em:targetPlatform>Darwin</em:targetPlatform>
-    <em:targetPlatform>Linux</em:targetPlatform>
     <em:strictCompatibility>true</em:strictCompatibility>
 
     <!-- Front End MetaData -->
-    <em:name>Firefox Update Hotfix</em:name>
+    <em:name>Firefox Hotfix</em:name>
     <em:description>Delivers necessary support-related notifications and/or updates for Firefox without requiring a software update.</em:description>
     <em:creator>Mozilla</em:creator>
 
     <em:targetApplication>
       <Description>
         <!-- Firefox -->
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
-        <em:minVersion>15.0a1</em:minVersion>
-        <em:maxVersion>18.0a1</em:maxVersion>
+        <em:minVersion>18.0</em:minVersion>
+        <em:maxVersion>19.0.*</em:maxVersion>
       </Description>
     </em:targetApplication>
 
   </Description>
 </RDF>