Examine source code of Mail My Tabs

{
  "name": "Mail My Tabs",
  "description": "Email all open tabs in current window. Keyboard Shortcut: Alt + M.",
  "permissions": [
    "tabs"
  ],
  "version": "0.0.2",
  "icons": {
    "48": "static/48.png",
    "128": "static/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "static/128.png",
    "default_title": "Mail My Tabs"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+M"
      }
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "manifest_version": 2,
  "homepage_url": "https://browsernative.com/mail-my-tabs/",
  "developer": {
    "name": "BrowserNative",
    "url": "https://browsernative.com/mail-my-tabs/"
  }
}