Examine source code of Sugoi Shimeji

{
  "manifest_version": 2,
  "name": "Sugoi Shimeji",
  "version": "2.0.0",
  "description": "Small animated characters that you can interact with.",
  "icons": {
    "32": "icon_32.png",
    "512": "icon_512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon_512.png",
    "default_title": "Sugoi Shimeji",
    "default_popup": "./popup/index.html"
  },
  "web_accessible_resources": [
    "media/*"
  ]
}