User interface

  </td>
</tr>
<tr>
  <td>
    Toolbar button with a
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Popups"
      >popup</a
    >
  </td>
  <td>
    A popup on a button in the browser toolbar that opens when the button is
    clicked. The popup is defined in an HTML document that handles the user
    interaction.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Page_actions"
      >Address bar button</a
    >
    (page action)
  </td>
  <td>
    A button on the browser address bar that dispatches an event to the
    extension when clicked. By default, the button is hidden in all tabs.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    Address bar button with a
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Popups"
      >popup</a
    >
  </td>
  <td>
    A popup on a button in the browser address bar that opens when the
    button is clicked. The popup is defined in an HTML document that handles
    the user interaction.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Context_menu_items"
      >Context menu item</a
    >
  </td>
  <td>
    Menu items, checkboxes, and radio buttons on one or more of the
    browser's context menus. Also, menus can be structured by adding
    separators. When menu items are clicked, an event is dispatched to the
    extension.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Sidebars"
      >Sidebar</a
    >
  </td>
  <td>
    <p>
      An HTML document displayed next to a web page, with the option for
      unique content per page. The sidebar is opened when the extension is
      installed, then obeys the user's sidebar visibility selection. User
      interaction within the sidebar is handled by its HTML document.
    </p>
  </td>
  <td></td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Options_pages"
      >Options page</a
    >
  </td>
  <td>
    A page that enables you to define preferences for your extension that
    your users can change. The user can access this page from the browser's
    add-ons manager.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Extension_pages"
      >Extension page</a
    >
  </td>
  <td>
    Use web pages included in your extension to provide forms, help, or any
    other content required, within windows or tabs.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Notifications"
      >Notification</a
    >
  </td>
  <td>
    Transient notifications displayed to the user through the underlying
    operating system's notifications mechanism. Dispatches an event to the
    extension when the user clicks a notification, or when a notification
    closes (either automatically or at the user's request).
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Omnibox"
      >Address bar suggestion</a
    >
  </td>
  <td>
    Offer custom address bar suggestions when the user enters a keyword.
  </td>
  <td>
    
  </td>
</tr>
<tr>
  <td>
    <a
      href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/devtools_panels"
      >Developer tools panel</a
    >
  </td>
  <td>
    A tab with an associated HTML document that displays in the browser's
    developer tools.
  </td>
  <td>
    
  </td>
</tr>