--- a/browser/devtools/profiler/ProfilerPanel.jsm
+++ b/browser/devtools/profiler/ProfilerPanel.jsm
@@ -465,18 +465,20 @@ ProfilerPanel.prototype = {
         viewSource(data.uri, null, this.document, data.line);
     }
 
     gDevTools.showToolbox(this.target, "jsdebugger").then(function (toolbox) {
       let dbg = toolbox.getCurrentPanel();
       panelWin = dbg.panelWin;
 
       let view = dbg.panelWin.DebuggerView;
-      if (view.Source && view.Sources.selectedValue === data.uri) {
-        return void view.editor.setCaretPosition(data.line - 1);
+      if (view.Sources.selectedValue === data.uri) {
+        view.editor.setCaretPosition(data.line - 1);
+        onOpen();
+        return;
       }
 
       panelWin.addEventListener("Debugger:SourceShown", onSourceShown, false);
       panelWin.DebuggerView.Sources.preferredSource = data.uri;
     }.bind(this));
   },
 
   /**

--- a/browser/devtools/profiler/test/browser_profiler_bug_834878_source_buttons.js
+++ b/browser/devtools/profiler/test/browser_profiler_bug_834878_source_buttons.js
@@ -13,17 +13,26 @@ function test() {
       let data = { uri: SCRIPT, line: 5, isChrome: false };
 
       panel.displaySource(data, function onOpen() {
         let target = TargetFactory.forTab(tab);
         let dbg = gDevTools.getToolbox(target).getPanel("jsdebugger");
         let view = dbg.panelWin.DebuggerView;
 
         is(view.Sources.selectedValue, data.uri, "URI is different");
-        is(view.editor.getCaretPosition().line, data.line - 1, "Line is different");
+        is(view.editor.getCaretPosition().line, data.line - 1,
+          "Line is different");
 
-        tearDown(tab);
+        // Test the case where script is already loaded.
+        view.editor.setCaretPosition(1);
+        gDevTools.showToolbox(target, "jsprofiler").then(function () {
+          panel.displaySource(data, function onOpenAgain() {
+            is(view.editor.getCaretPosition().line, data.line - 1,
+              "Line is different");
+            tearDown(tab);
+          });
+        });
       });
     });
 
     panel.createProfile();
   });
 }