es between API implementations ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Differences_between_API_implementations)
    10. [ Chrome incompatibilities ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Chrome_incompatibilities)
  4. User interface 
    1. [ User interface ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface)
    2. [ Toolbar button ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Browser_action)
    3. [ Address bar button ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Page_actions)
    4. [ Sidebars ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Sidebars)
    5. [ Context menu items ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Context_menu_items)
    6. [ Options page ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Options_pages)
    7. [ Extension pages ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Extension_pages)
    8. [ Notifications ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Notifications)
    9. [ Address bar suggestions ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Omnibox)
    10. [ devtools panels ](/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/devtools_panels)
  5. How to 
    1. [ Intercept HTTP requests ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Intercept_HTTP_requests)
    2. [ Modify a web page ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Modify_a_web_page)
    3. [ Insert external content ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Safely_inserting_external_content_into_a_page)
    4. [ Share objects with page scripts ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Sharing_objects_with_page_scripts)
    5. [ Add a button to the toolbar ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Add_a_button_to_the_toolbar)
    6. [ Implement a settings page ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Implement_a_settings_page)
    7. [ Work with the Tabs API ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Working_with_the_Tabs_API)
    8. [ Work with the Bookmarks API ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_the_Bookmarks_API)
    9. [ Work with the Cookies API ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_the_Cookies_API)
    10. [ Work with contextual identities ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_contextual_identities)
    11. [ Interact with the clipboard ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Interact_with_the_clipboard)
    12. [ Extend the developer tools ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Extending_the_developer_tools)
    13. [ Build a cross-browser extension ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Build_a_cross_browser_extension)
  6. JavaScript APIs 
    1. [ Browser support for JavaScript APIs ](/en-US/docs/Mozilla/Add-ons/WebExtensions/Browser_support_for_JavaScript_APIs)
    2. [ action ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/action)
    3. [ alarms ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/alarms)
    4. [ bookmarks ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/bookmarks)
    5. [ browserAction ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserAction)
    6. [ browserSettings ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserSettings)
    7. [ browsingData ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browsingData)
    8. [ captivePortal ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/captivePortal)
    9. [ clipboard ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/clipboard)
    10. [ commands ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/commands)
    11. [ contentScripts ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/contentScripts)
    12. [ contextualIdentities ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/contextualIdentities)
    13. [ cookies ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies)
    14. [ declarativeNetRequest ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest)
    15. [ devtools ](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/devtools)
    16. [ dns ](/en-US