--- a/browser/devtools/scratchpad/scratchpad.xul
+++ b/browser/devtools/scratchpad/scratchpad.xul
@@ -161,16 +161,20 @@
   <key id="key_findAgain"
        keycode="VK_F3"
        command="cmd_findAgain"/>
   <key id="key_findPrevious"
        keycode="VK_F3"
        command="cmd_findPrevious"
        modifiers="shift"/>
 #endif
+  <key id="key_gotoLine"
+       key="&gotoLineCmd.key;"
+       command="cmd_gotoLine"
+       modifiers="accel"/>
 </keyset>
 
 
 <menubar id="sp-menubar">
   <menu id="sp-file-menu" label="&fileMenu.label;"
         accesskey="&fileMenu.accesskey;">
     <menupopup id="sp-menu-filepopup">
       <menuitem id="sp-menu-newscratchpad"
@@ -253,16 +257,22 @@
                 accesskey="&findCmd.accesskey;"
                 key="key_find"
                 command="cmd_find"/>
       <menuitem id="sp-menu-findAgain"
                 label="&findAgainCmd.label;"
                 accesskey="&findAgainCmd.accesskey;"
                 key="key_findAgain"
                 command="cmd_findAgain"/>
+      <menuseparator/>
+      <menuitem id="sp-menu-gotoLine"
+                label="&gotoLineCmd.label;"
+                accesskey="&gotoLineCmd.accesskey;"
+                key="key_gotoLine"
+                command="cmd_gotoLine"/>
     </menupopup>
   </menu>
 
   <menu id="sp-execute-menu" label="&executeMenu.label;"
         accesskey="&executeMenu.accesskey;">
     <menupopup id="sp-menu_executepopup">
       <menuitem id="sp-text-run"
                 label="&run.label;"

--- a/browser/devtools/scratchpad/test/Makefile.in
+++ b/browser/devtools/scratchpad/test/Makefile.in
@@ -53,16 +53,17 @@ include $(topsrcdir)/config/rules.mk
 		browser_scratchpad_ui.js \
 		browser_scratchpad_bug_646070_chrome_context_pref.js \
 		browser_scratchpad_bug_660560_tab.js \
 		browser_scratchpad_open.js \
 		browser_scratchpad_restore.js \
 		browser_scratchpad_bug_679467_falsy.js \
 		browser_scratchpad_bug_699130_edit_ui_updates.js \
 		browser_scratchpad_bug_669612_unsaved.js \
-		head.js \
 		browser_scratchpad_bug_653427_confirm_close.js \
 		browser_scratchpad_bug684546_reset_undo.js \
 		browser_scratchpad_bug690552_display_outputs_errors.js \
 		browser_scratchpad_bug650345_find_ui.js \
+		browser_scratchpad_bug714942_goto_line_ui.js \
+		head.js \
 
 libs:: $(_BROWSER_TEST_FILES)
 	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/browser/$(relativesrcdir)

new file mode 100644
--- /dev/null
+++ b/browser/devtools/scratchpad/test/browser_scratchpad_bug714942_goto_line_ui.js
@@ -0,0 +1,45 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test()
+{
+  waitForExplicitFinish();
+
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function browserLoad() {
+    gBrowser.selectedBrowser.removeEventListener("load", browserLoad, true);
+    openScratchpad(runTests);
+  }, true);
+
+  content.location = "data:text/html,<p>test the 'Jump to line' feature in Scratchpad";
+}
+
+function runTests(aWindow, aScratchpad)
+{
+  let editor = aScratchpad.editor;
+  let text = "foobar bug650345\nBug650345 bazbaz\nfoobar omg\ntest";
+  editor.setText(text);
+  editor.setCaretOffset(0);
+
+  let oldPrompt = Services.prompt;
+  let desiredValue = null;
+  Services.prompt = {
+    prompt: function(aWindow, aTitle, aMessage, aValue) {
+      aValue.value = desiredValue;
+      return true;
+    },
+  };
+
+  desiredValue = 3;
+  EventUtils.synthesizeKey("J", {accelKey: true}, aWindow);
+  is(editor.getCaretOffset(), 34, "caret offset is correct");
+
+  desiredValue = 2;
+  aWindow.goDoCommand("cmd_gotoLine")
+  is(editor.getCaretOffset(), 17, "caret offset is correct (again)");
+
+  Services.prompt = oldPrompt;
+
+  finish();
+}

--- a/browser/devtools/sourceeditor/source-editor-orion.jsm
+++ b/browser/devtools/sourceeditor/source-editor-orion.jsm
@@ -287,16 +287,17 @@ SourceEditor.prototype = {
       "undo": [this.undo, this],
       "redo": [this.redo, this],
       "tab": [this._doTab, this],
       "Unindent Lines": [this._doUnindentLines, this],
       "enter": [this._doEnter, this],
       "Find...": [this.ui.find, this.ui],
       "Find Next Occurrence": [this.ui.findNext, this.ui],
       "Find Previous Occurrence": [this.ui.findPrevious, this.ui],
+      "Goto Line...": [this.ui.gotoLine, this.ui],
     };
 
     for (let name in actions) {
       let action = actions[name];
       this._view.setAction(name, action[0].bind(action[1]));
     }
 
     let keys = (config.keys || []).concat(DEFAULT_KEYBINDINGS);

--- a/browser/devtools/sourceeditor/source-editor-overlay.xul
+++ b/browser/devtools/sourceeditor/source-editor-overlay.xul
@@ -37,10 +37,11 @@
    - ***** END LICENSE BLOCK ***** -->
 
 <overlay id="sourceEditorOverlay"
          xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
   <commandset id="sourceEditorCommands">
     <command id="cmd_find" oncommand="goDoCommand('cmd_find')"/>
     <command id="cmd_findAgain" oncommand="goDoCommand('cmd_findAgain')" disabled="true"/>
     <command id="cmd_findPrevious" oncommand="goDoCommand('cmd_findPrevious')" disabled="true"/>
+    <command id="cmd_gotoLine" oncommand="goDoCommand('cmd_gotoLine')"/>
   </commandset>
 </overlay>

--- a/browser/devtools/sourceeditor/source-editor-ui.jsm
+++ b/browser/devtools/sourceeditor/source-editor-ui.jsm
@@ -71,16 +71,44 @@ SourceEditorUI.prototype = {
   {
     if (this._ownerWindow.controllers) {
       this._controller = new SourceEditorController(this.editor);
       this._ownerWindow.controllers.insertControllerAt(0, this._controller);
     }
   },
 
   /**
+   * The "go to line" command UI. This displays a prompt that allows the user to
+   * input the line number to jump to.
+   */
+  gotoLine: function SEU_gotoLine()
+  {
+    let oldLine = this.editor.getCaretPosition ?
+                  this.editor.getCaretPosition().line : null;
+    let newLine = {value: oldLine !== null ? oldLine + 1 : ""};
+
+    let result = Services.prompt.prompt(this._ownerWindow,
+      SourceEditorUI.strings.GetStringFromName("gotoLineCmd.promptTitle"),
+      SourceEditorUI.strings.GetStringFromName("gotoLineCmd.promptMessage"),
+      newLine, null, {});
+
+    newLine.value = parseInt(newLine.value);
+    if (result && !isNaN(newLine.value) && --newLine.value != oldLine) {
+      if (this.editor.getLineCount) {
+        let lines = this.editor.getLineCount() - 1;
+        this.editor.setCaretPosition(Math.max(0, Math.min(lines, newLine.value)));
+      } else {
+        this.editor.setCaretPosition(Math.max(0, newLine.value));
+      }
+    }
+
+    return true;
+  },
+
+  /**
    * The "find" command UI. This displays a prompt that allows the user to input
    * the string to search for in the code. By default the current selection is
    * used as a search string, or the last search string.
    */
   find: function SEU_find()
   {
     let str = {value: this.editor.getSelectedText()};
     if (!str.value && this.editor.lastFind) {
@@ -186,16 +214,17 @@ SourceEditorController.prototype = {
   supportsCommand: function SEC_supportsCommand(aCommand)
   {
     let result;
 
     switch (aCommand) {
       case "cmd_find":
       case "cmd_findAgain":
       case "cmd_findPrevious":
+      case "cmd_gotoLine":
         result = true;
         break;
       default:
         result = false;
         break;
     }
 
     return result;
@@ -210,16 +239,17 @@ SourceEditorController.prototype = {
    *         True if the command is enabled, false otherwise.
    */
   isCommandEnabled: function SEC_isCommandEnabled(aCommand)
   {
     let result;
 
     switch (aCommand) {
       case "cmd_find":
+      case "cmd_gotoLine":
         result = true;
         break;
       case "cmd_findAgain":
       case "cmd_findPrevious":
         result = this._editor.lastFind && this._editor.lastFind.lastFound != -1;
         break;
       default:
         result = false;
@@ -243,13 +273,16 @@ SourceEditorController.prototype = {
         this._editor.ui.find();
         break;
       case "cmd_findAgain":
         this._editor.ui.findNext();
         break;
       case "cmd_findPrevious":
         this._editor.ui.findPrevious();
         break;
+      case "cmd_gotoLine":
+        this._editor.ui.gotoLine();
+        break;
     }
   },
 
   onEvent: function() { }
 };

--- a/browser/locales/en-US/chrome/browser/devtools/scratchpad.dtd
+++ b/browser/locales/en-US/chrome/browser/devtools/scratchpad.dtd
@@ -78,16 +78,20 @@
 <!ENTITY findAgainCmd.key             "G">
 <!ENTITY findAgainCmd.accesskey       "g">
 <!-- LOCALIZATION NOTE (findPreviousCmd.key): This key is used only on Macs.
   -  Windows and Linux builds use the Shift-F3 key which is not localizable on
   -  purpose.
   -->
 <!ENTITY findPreviousCmd.key          "G">
 
+<!ENTITY gotoLineCmd.label            "Jump to line…">
+<!ENTITY gotoLineCmd.key              "J">
+<!ENTITY gotoLineCmd.accesskey        "J">
+
 <!ENTITY run.label                    "Run">
 <!ENTITY run.accesskey                "R">
 <!ENTITY run.key                      "r">
 
 <!ENTITY inspect.label                "Inspect">
 <!ENTITY inspect.accesskey            "I">
 <!ENTITY inspect.key                  "i">
 

--- a/browser/locales/en-US/chrome/browser/devtools/sourceeditor.properties
+++ b/browser/locales/en-US/chrome/browser/devtools/sourceeditor.properties
@@ -13,8 +13,18 @@
 # when the user wants to search for a string in the code. You can
 # access this feature by pressing Ctrl-F on Windows/Linux or Cmd-F on Mac.
 findCmd.promptTitle=Find…
 
 # LOCALIZATION NOTE  (gotoLineCmd.promptMessage): This is the message shown when
 # the user wants to search for a string in the code. You can
 # access this feature by pressing Ctrl-F on Windows/Linux or Cmd-F on Mac.
 findCmd.promptMessage=Search for:
+
+# LOCALIZATION NOTE  (gotoLineCmd.promptTitle): This is the dialog title used
+# when the user wants to jump to a specific line number in the code. You can
+# access this feature by pressing Ctrl-J on Windows/Linux or Cmd-J on Mac.
+gotoLineCmd.promptTitle=Go to line…
+
+# LOCALIZATION NOTE  (gotoLineCmd.promptMessage): This is the message shown when
+# the user wants to jump to a specific line number in the code. You can
+# access this feature by pressing Ctrl-J on Windows/Linux or Cmd-J on Mac.
+gotoLineCmd.promptMessage=Jump to line number: