--- a/browser/base/content/browser-social.js
+++ b/browser/base/content/browser-social.js
@@ -394,44 +394,46 @@ SocialShare = {
     // define at least url. If it is undefined, we're sharing the current url in
     // the browser tab.
     let pageData = graphData ? graphData : this.currentShare;
     let sharedURI = pageData ? Services.io.newURI(pageData.url, null, null) :
                                 gBrowser.currentURI;
     if (!SocialUI.canSharePage(sharedURI))
       return;
 
+    let browserMM = gBrowser.selectedBrowser.messageManager;
+
     // the point of this action type is that we can use existing share
     // endpoints (e.g. oexchange) that do not support additional
     // socialapi functionality.  One tweak is that we shoot an event
     // containing the open graph data.
     let _dataFn;
     if (!pageData || sharedURI == gBrowser.currentURI) {
-      messageManager.addMessageListener("PageMetadata:PageDataResult", _dataFn = (msg) => {
-        messageManager.removeMessageListener("PageMetadata:PageDataResult", _dataFn);
+      browserMM.addMessageListener("PageMetadata:PageDataResult", _dataFn = (msg) => {
+        browserMM.removeMessageListener("PageMetadata:PageDataResult", _dataFn);
         let pageData = msg.json;
         if (graphData) {
           // overwrite data retreived from page with data given to us as a param
           for (let p in graphData) {
             pageData[p] = graphData[p];
           }
         }
         this.sharePage(providerOrigin, pageData, target, anchor);
       });
-      gBrowser.selectedBrowser.messageManager.sendAsyncMessage("PageMetadata:GetPageData", null, { target });
+      browserMM.sendAsyncMessage("PageMetadata:GetPageData", null, { target });
       return;
     }
     // if this is a share of a selected item, get any microformats
     if (!pageData.microformats && target) {
-      messageManager.addMessageListener("PageMetadata:MicroformatsResult", _dataFn = (msg) => {
-        messageManager.removeMessageListener("PageMetadata:MicroformatsResult", _dataFn);
+      browserMM.addMessageListener("PageMetadata:MicroformatsResult", _dataFn = (msg) => {
+        browserMM.removeMessageListener("PageMetadata:MicroformatsResult", _dataFn);
         pageData.microformats = msg.data;
         this.sharePage(providerOrigin, pageData, target, anchor);
       });
-      gBrowser.selectedBrowser.messageManager.sendAsyncMessage("PageMetadata:GetMicroformats", null, { target });
+      browserMM.sendAsyncMessage("PageMetadata:GetMicroformats", null, { target });
       return;
     }
     this.currentShare = pageData;
 
     let provider;
     if (providerOrigin)
       provider = Social._getProviderFromOrigin(providerOrigin);
     else