Examine source code of YTime Tracker

{
  "manifest_version" : 2 ,
  "name" : "YTime Tracker — Active & Idle Time",
  "version" : "1.2.0",
  "description" : "Your Time Tracker. Tracks browsing time and activity locally. Unlimited history, weekly bars. Privacy focused.",
  "browser_specific_settings": {
    "gecko": {
      "id": "ytime-tracker@firefox",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "permissions" : [
    "tabs" ,
    "storage" ,
    "alarms" ,
    "activeTab" ,
    "idle" ,
    "notifications" ,
    "<all_urls>" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "persistent" : true 
  },
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icons/icon16.png",
      "48" : "icons/icon48.png",
      "128" : "icons/icon128.png"
    }
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "icons" : {
    "16" : "icons/icon16.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://*.youtube.com/*" 
      ],
      "js" : [
        "content_youtube.js" 
      ],
      "run_at" : "document_idle" 
    },
    {
      "matches" : [
        "https://*.spotify.com/*" ,
        "https://music.yandex.ru/*" ,
        "https://music.yandex.com/*" ,
        "https://vk.com/*" ,
        "https://music.apple.com/*" ,
        "https://soundcloud.com/*" 
      ],
      "js" : [
        "content_music.js" 
      ],
      "run_at" : "document_idle" 
    },
    {
      "matches" : [
        "https://*.twitch.tv/*" 
      ],
      "js" : [
        "content_twitch.js" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "web_accessible_resources" : [
    "blocked.html"
  ]
}