Examine source code of Memory

{
  "name": "Memory",
  "version": "0.0.0.20",
  "description": "Search through everything you've read",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "nativeMessaging",
    "tabs",
    "identity",
    "identity.email",
    "history",
    "contextMenus",
    "bookmarks",
    "alarms"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "css/content_script.css"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "https://calendar.google.com/*"
      ],
      "js": [
        "calendar.js"
      ]
    }
  ],
  "icons": {
    "16": "assets/planets_16.png",
    "48": "assets/planets_48.png",
    "128": "assets/planets_128.png"
  },
  "web_accessible_resources": [
    "popup.html",
    "index.html"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "browserindexer@memory.com",
      "strict_min_version": "42.0"
    }
  },
  "applications": {
    "gecko": {
      "id": "browserindexer@memory.com",
      "strict_min_version": "50.0"
    }
  }
}