Be more explicit about which browser content object is focused and when.

application/palemoon/base/content/utilityOverlay.js

@@ -328,6 +328,7 @@ function openLinkIn(url, where, params) {
   // result in a new frontmost window (e.g. "javascript:window.open('');").
   w.focus();
 
+  let browserUsedForLoad = null;
   switch (where) {
   case "current":
     let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
@@ -346,27 +347,35 @@ function openLinkIn(url, where, params) {
                                 referrerPolicy: aReferrerPolicy,
                                 postData: aPostData,
                                 }); 
+    browserUsedForLoad = aCurrentBrowser;
     break;
   case "tabshifted":
     loadInBackground = !loadInBackground;
     // fall through
   case "tab":
     let browser = w.gBrowser;
-    browser.loadOneTab(url, {
-                       referrerURI: aReferrerURI,
-                       referrerPolicy: aReferrerPolicy,
-                       charset: aCharset,
-                       postData: aPostData,
-                       inBackground: loadInBackground,
-                       allowThirdPartyFixup: aAllowThirdPartyFixup,
-                       relatedToCurrent: aRelatedToCurrent});
+    let tabUsedForLoad = browser.loadOneTab(url, {
+                           referrerURI: aReferrerURI,
+                           referrerPolicy: aReferrerPolicy,
+                           charset: aCharset,
+                           postData: aPostData,
+                           inBackground: loadInBackground,
+                           allowThirdPartyFixup: aAllowThirdPartyFixup,
+                           relatedToCurrent: aRelatedToCurrent});
+    browserUsedForLoad = tabUsedForLoad.linkedBrowser;
     break;
   }
 
-  w.gBrowser.selectedBrowser.focus();
+  // Focus the content, but only if the browser used for the load is selected.
+  if (browserUsedForLoad &&
+      browserUsedForLoad == browserUsedForLoad.getTabBrowser().selectedBrowser) {
+    browserUsedForLoad.focus();
+  }
 
   if (!loadInBackground && w.isBlankPageURL(url))
-    w.focusAndSelectUrlBar();
+    if (!w.focusAndSelectUrlBar()) {
+      console.error("Unable to focus and select address bar.")
+    }
 }
 
 // Used as an onclick handler for UI elements with link-like behavior.