Examine source code of Focus Music Player

{
  "manifest_version": 2,
  "version": "1.5.1",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "64": "icons/hideshort-64.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "./src/HidingShortsMore.js",
        "./src/main.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "default_locale": "en",
  "browser_action": {
    "default_icon": {
      "64": "icons/hideshort-64.png"
    },
    "default_title": "Hide Youtube Shorts",
    "default_popup": "./src/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{648ffb69-eb83-4bfc-9057-330a00f14875}"
    }
  }
}