Index: mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
===================================================================
RCS file: /cvsroot/mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js,v
retrieving revision 1.26
diff -u -r1.26 mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
--- mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
+++ mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
@@ -167,6 +167,28 @@
 
   cmdNewRule: function()
   {
+    var bundle = this.mPanel.panelset.stringBundle;
+    var msg = bundle.getString("styleRuleNew.message");
+    var title = bundle.getString("styleRuleNew.title");
+
+    var rule = { value: "" };
+    var dummy = { value: false };
+
+    if (!gPromptService.prompt(window, title, msg, rule, null, dummy)) {
+      return;
+    }
+
+    this.mRulesBoxObject.beginUpdateBatch();
+    var ruleView = this.mRuleView;
+    var stylesheet;
+    if (ruleView.mSheetRules && ruleView.mSheetRules.length)
+      stylesheet = ruleView.mSheetRules[0].parentStyleSheet;
+    else if (ruleView.mRules && ruleView.mRules.Count())
+      stylesheet = ruleView.mRules.GetElementAt(0).parentStyleSheet;
+
+    if (stylesheet)
+      stylesheet.insertRule(rule.value, 1);
+    this.mRulesBoxObject.endUpdateBatch();
   },
   
   cmdToggleSelectedRule: function()
Index: mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.xul
===================================================================
RCS file: /cvsroot/mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.xul,v
retrieving revision 1.22
diff -u -r1.22 mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.xul
--- mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.xul
+++ mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.xul
@@ -30,7 +30,7 @@
   <!--============================= POPUPS ============================== -->
 
   <popupset id="psPopups">
-    <popup id="ppStyleRuleContext" onpopupshowing="return viewer.onpopupshowingRulePopup()">
+    <popup id="ppStyleRuleContext" onpopupshowing="return viewer.onCreateRulePopup()">
       <menuitem label="&newRules.label;" oncommand="viewer.cmdNewRule()"/>
       <menuitem label="&deleteSelectedRules.label;" oncommand="viewer.cmdDeleteSelectedRule()"/>
       <menuitem label="&disableSelectedRules.label;" oncommand="viewer.cmdToggleSelectedRule()"/>
@@ -52,6 +52,7 @@
   <!--============================= CONTENT ============================== -->
 
   <tree id="olStyleRules" class="plain" flex="1" persist="height"
+            contextmenu="ppStyleRuleContext"
             onselect="viewer.onRuleSelect()">
     <treecols>
       <treecol id="olcRule" label="&styleRule.label;" flex="1"/>
Index: mozilla/extensions/inspector/resources/locale/en-US/inspector.properties
===================================================================
RCS file: /cvsroot/mozilla/extensions/inspector/resources/locale/en-US/inspector.properties,v
retrieving revision 1.7
diff -u -r1.7 mozilla/extensions/inspector/resources/locale/en-US/inspector.properties
--- mozilla/extensions/inspector/resources/locale/en-US/inspector.properties
+++ mozilla/extensions/inspector/resources/locale/en-US/inspector.properties
@@ -38,6 +38,10 @@
 inspectURL.title = Inspect URL
 inspectURL.message = Enter a URL:
 inspectWindow.noDocuments.message = (None)
+inspectWindow.error.message = Unable to switch to the requested window.
+inspectWindow.error.title = Inspect Window Error
+styleRuleNew.title = New Style Rule
+styleRuleNew.message = Enter rule:
 styleRuleNewProperty.title = New Style Rule
 styleRuleEditProperty.title = Edit Style Rule
 styleRulePropertyValue.message = Enter the property value: