Examine source code of Thankful

{
  "description": "Support free culture by automatically sending cryptocurrency to the creators of the content you love.",
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_title": "Thankful",
    "default_icon": "icons/handshake.png",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "alarms",
    "idle",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ]
  },
  "version": "0.6.10resigned1",
  "name": "Thankful",
  "icons": {
    "64": "icons/handshake.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content_youtube/index.js"
      ]
    },
    {
      "matches": [
        "*://*.medium.com/*"
      ],
      "js": [
        "content_medium/index.js"
      ]
    }
  ],
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "{b4bbcd8e-acc0-4044-b09b-1c15d0b66875}",
      "strict_min_version": "57.0"
    }
  }
}