Examine source code of MasterTube

{
  "icons": {
    "16": "icon16.plasmo.e7bcd3ac.png",
    "32": "icon32.plasmo.ce39377b.png",
    "48": "icon48.plasmo.3c17e113.png",
    "64": "icon64.plasmo.df317abe.png",
    "128": "icon128.plasmo.6a4310c5.png"
  },
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "icon16.plasmo.e7bcd3ac.png",
      "32": "icon32.plasmo.ce39377b.png",
      "48": "icon48.plasmo.3c17e113.png",
      "64": "icon64.plasmo.df317abe.png",
      "128": "icon128.plasmo.6a4310c5.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.1.2",
  "author": "Mastertube",
  "name": "MasterTube",
  "description": "Track your progress, measure your success, and stay ahead of the competition with our YouTube analytics tool.",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "webRequest",
    "https://app-api.master.tube/api/",
    "https://yt.lemnoslife.com/",
    "https://yt3.googleusercontent.com/",
    "https://yt3.ggpht.com/",
    "https://i.ytimg.com/",
    "https://youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "youtube-channel-videos.97236539.js"
      ],
      "css": []
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "youtube-channel.eed560c1.js"
      ],
      "css": [
        "youtube-channel.5456ed3b.css"
      ]
    },
    {
      "matches": [
        "https://studio.youtube.com/*"
      ],
      "js": [
        "youtube-comment-emoji-and-stylings.b3b78b22.js"
      ],
      "css": []
    },
    {
      "matches": [
        "https://studio.youtube.com/*"
      ],
      "js": [
        "youtube-studio.7aa60221.js"
      ],
      "css": []
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "youtube-video-bottom.752ec583.js"
      ],
      "css": []
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "youtube-video-sidebar.ade04aef.js"
      ],
      "css": []
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "office@master.tube"
    }
  },
  "web_accessible_resources": [
    "youtube-channel-videos.97dea73a.css",
    "youtube-channel-videos.7a864a96.png",
    "youtube-channel-videos.d8798100.png",
    "youtube-channel-videos.5d8f7de5.png",
    "youtube-channel-videos.5775587b.png",
    "youtube-video-sidebar.1b3f331c.png"
  ]
}