--- a/mobile/android/chrome/content/aboutDownloads.js
+++ b/mobile/android/chrome/content/aboutDownloads.js
@@ -417,17 +417,17 @@ let Downloads = {
   openDownload: function dl_openDownload(aItem) {
     this._getDownloadForElement(aItem, function(aDownload) {
       try {
         let f = aDownload.targetFile;
         if (f) f.launch();
       } catch (ex) {
         this.logError("openDownload() " + ex, aDownload);
       }
-    });
+    }.bind(this));
   },
 
   removeDownload: function dl_removeDownload(aItem) {
     this._getDownloadForElement(aItem, function(aDownload) {
       let f = null;
       try {
         f = aDownload.targetFile;
       } catch (ex) {
@@ -436,17 +436,17 @@ let Downloads = {
         f = { leafName: "" };
       }
       aDownload.remove();
       try {
         if (f) f.remove();
       } catch (ex) {
         this.logError("removeDownload() " + ex, aDownload);
       }
-    });
+    }.bind(this));
     aItem.parentNode.removeChild(aItem);
   },
 
   deleteAll: function dl_deleteAll() {
     let title = gStrings.GetStringFromName("downloadAction.deleteAll");
     let messageForm = gStrings.GetStringFromName("downloadMessage.deleteAll");
     let elements = document.body.querySelectorAll("li[state='" + this._dlmgr.DOWNLOAD_FINISHED + "']," +
                                                "li[state='" + this._dlmgr.DOWNLOAD_CANCELED + "']," +