Examine source code of ThumbnailTest.com Analytics Processor

{
  "manifest_version": 3,
  "name": "ThumbnailTest.com Analytics Processor",
  "description": "Automatically grab analytics from youtube studio to track your A/B testing results. For use with ThumbnailTest.com only.",
  "version": "1.6.8",
  "options_ui": {
    "page": "options.html"
  },
  "icons": {
    "16": "AppIcons/16.png",
    "32": "AppIcons/32.png",
    "64": "AppIcons/64.png",
    "128": "AppIcons/128.png"
  },
  "action": {
    "default_icon": {
      "16": "AppIcons/16.png",
      "32": "AppIcons/32.png",
      "64": "AppIcons/64.png",
      "128": "AppIcons/128.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://app.thumbnailtest.com/*",
        "*://youtube.com/*",
        "*://studio.youtube.com/*"
      ],
      "exclude_matches": [
        "*://studio.youtube.com/video/*/editor"
      ],
      "js": [
        "js/content_script.js",
        "js/inject.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "js/sendConfig.js",
        "js/sweet.js"
      ],
      "matches": [
        "*://app.thumbnailtest.com/*",
        "*://youtube.com/*",
        "*://studio.youtube.com/*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "*://app.thumbnailtest.com/*",
    "*://youtube.com/*",
    "*://studio.youtube.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "dev@thumbnailtest.com"
    }
  }
}