diff --git a/context-menu-demo/README.md b/context-menu-demo/README.md
index a748a5d..35bc114 100644
--- a/context-menu-demo/README.md
+++ b/context-menu-demo/README.md
@@ -9,15 +9,12 @@ This add-on adds several items to the browser's context menu:
 * one shown when there is a selection in the page, that logs the selected text
 when clicked.
 * one shown in all contexts, that is removed when clicked.
-* two "radio" items that are shown when a page under "developer.mozilla.org"
-is loaded. These items are grouped using a separator item on each side.
+* two "radio" items that are shown in all contexts.
+These items are grouped using a separator item on each side.
 One radio item adds a blue border to the page, the other adds a green border.
 * one "checkbox" item, shown in all contexts, whose title is updated when the
 item is clicked.
 
-Note that the "documentUrlPatterns" option is not
-currently supported in Firefox.
-
 ## What it shows
 
 * How to create various types of context menu item:
diff --git a/context-menu-demo/background.js b/context-menu-demo/background.js
index 11cf25e..456db8e 100644
--- a/context-menu-demo/background.js
+++ b/context-menu-demo/background.js
@@ -24,9 +24,6 @@ function onRemoved() {
 
 /*
 Create all the context menu items.
-
-Note that the "documentUrlPatterns" option is not
-currently supported in Firefox.
 */
 chrome.contextMenus.create({
   id: "log-selection",
@@ -43,7 +40,6 @@ chrome.contextMenus.create({
 chrome.contextMenus.create({
   id: "separator-1",
   type: "separator",
-  documentUrlPatterns: ["*://developer.mozilla.org/*"],
   contexts: ["all"]
 }, onCreated);
 
@@ -51,7 +47,6 @@ chrome.contextMenus.create({
   id: "greenify",
   type: "radio",
   title: chrome.i18n.getMessage("contextMenuItemGreenify"),
-  documentUrlPatterns: ["*://developer.mozilla.org/*"],
   contexts: ["all"],
   checked: true
 }, onCreated);
@@ -60,7 +55,6 @@ chrome.contextMenus.create({
   id: "bluify",
   type: "radio",
   title: chrome.i18n.getMessage("contextMenuItemBluify"),
-  documentUrlPatterns: ["*://developer.mozilla.org/*"],
   contexts: ["all"],
   checked: false
 }, onCreated);
@@ -68,7 +62,6 @@ chrome.contextMenus.create({
 chrome.contextMenus.create({
   id: "separator-2",
   type: "separator",
-  documentUrlPatterns: ["*://developer.mozilla.org/*"],
   contexts: ["all"]
 }, onCreated);