Examine source code of Mark Location

{
  "manifest_version": 2,
  "name": "Mark Location",
  "version": "1.1.0",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "firefox/mark_location.svg",
    "96": "firefox/mark_location.svg"
  },
  "applications": {
    "gecko": {
      "id": "marklocation@fluks"
    }
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "content_scripts/location.css"
      ],
      "js": [
        "common/browser-polyfill.js",
        "common/common.js",
        "content_scripts/location.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "firefox/mark_location.svg",
    "default_title": "Mark Location",
    "default_popup": "browser_action/popup.html"
  },
  "background": {
    "scripts": [
      "common/browser-polyfill.js",
      "common/idb.js",
      "common/common.js",
      "background/background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "<all_urls>"
  ]
}