Examine source code of Google Keep Quick Note V2

{
  "manifest_version": 2,
  "name": "Google Keep Quick Note V2",
  "version": "1.3",
  "description": "Quickly save notes, selected text, or webpage links to Google Keep.",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d33c87a-0e33-4653-bcce-301e7e3f3a64}"
    }
  }
}