Examine source code of Mark My Words

{
  "name": "Mark My Words",
  "version": "0.1.0",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "mark_my_words.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "96": "icons/mark_my_words_icon.png"
  },
  "permissions": [
    "activeTab",
    "menus",
    "contextMenus",
    "currentWindow",
    "active",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/mark_my_words_icon.png",
    "default_title": "Mark My Words"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{558d7019-679b-48f5-ab7a-bea672431121}"
    }
  }
}