Examine source code of Pinpointer

{
  "description": "Create and share links to arbitrary bits of webpages.",
  "manifest_version": 2,
  "name": "Pinpointer",
  "version": "1.2resigned1",
  "homepage_url": "https://github.com/Rumperuu/Pinpointer",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "theme_icons": [
      {
        "light": "icons/icon-32-light.png",
        "dark": "icons/icon-32.png",
        "size": 32
      }
    ],
    "default_title": "Pinpointer",
    "default_popup": "popups/choose_element.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content_scripts/checkPage.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8df71d9d-8f8b-4fd9-bb36-4c5a22576b35}"
    }
  }
}