Inject jQuery to Gmail (open console and paste this) and initialize gmail.js

var jq = document.createElement('script');
jq.src = "https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js";
document.getElementsByTagName('body')[0].appendChild(jq);

// {inject gmail.js}

var gmail = Gmail();

• gmail.get .visible_emails()
• gmail.get .user_email()
• gmail.get .storage_info()
• gmail.get .email_subject()
• gmail.get .email_ids()
• gmail.get .email_id()
• gmail.get .search_query()
• gmail.get .unread_emails()
• gmail.get .unread_inbox_emails()
• gmail.get .unread_draft_emails()
• gmail.get .unread_spam_emails()
• gmail.get .unread_forum_emails()
• gmail.get .unread_notification_emails()
• gmail.get .unread_promotion_emails()
• gmail.get .unread_social_emails()
• gmail.get .beta()

• gmail.check .is_thread()
• gmail.check .is_preview_pane()
• gmail.check .is_horizontal_split()
• gmail.check .is_vertical_split()
• gmail.check .is_tabbed_inbox()
• gmail.check .is_right_side_chat()
• gmail.check .is_google_apps_user()
• gmail.check .is_inside_email()
• gmail.check .is_priority_inbox()
• gmail.check .is_rapportive_installed()
• gmail.check .is_streak_installed()
• gmail.check .is_anydo_installed()
• gmail.check .is_boomerang_installed()
• gmail.check .is_xobini_installed()
• gmail.check .is_signal_installed()

• gmail.observe .http_requests()
• gmail.observe .actions()
• gmail.observe .on(action, callback)
  • unread
  • read
  • delete
  • mark_as_spam
  • mark_as_not_spam
  • label
  • archive
  • move_to_inbox
  • delete_forever
  • star
  • unstar
  • mark_as_important
  • mark_as_not_important
  • filter_messages_like_these
  • mute
  • unmute
  • add_to_tasks
  • move_label
  • save_draft
  • discard_draft
  • send_message
  • expand_categories
  • delete_label
  • show_newly_arrived_message
  • poll
  • new_email
  • refresh
• gmail.observe .off()

• gmail.dom .inbox_content()
• gmail.dom .email_subject()
• gmail.dom .email_body()
• gmail.dom .email_contents()
• gmail.dom .get_left_sidebar_links()
• gmail.dom .search_bar()

• gmail.tools .xhr_watcher()
• gmail.tools .parse_url()
• gmail.tools .deparam()
• gmail.tools .parse_view_data()
• gmail.tools .make_request()

• gmail.tracker .events
• gmail.tracker .xhr_init
• gmail.tracker .xhr_open
• gmail.tracker .xhr_send
• gmail.tracker .watchdog
• gmail.tracker .view_data
• gmail.tracker .ik
• gmail.tracker .rid