Examine source code of jp343 Track Your Japanese Immersion

{
  "manifest_version": 2,
  "name": "jp343 Track Your Japanese Immersion",
  "description": "Track your Japanese immersion automatically. Built-in dashboard with heatmap, streaks and session history.",
  "version": "2.8.6",
  "icons": {
    "16": "icon/icon-16.png",
    "32": "icon/icon-32.png",
    "48": "icon/icon-48.png",
    "128": "icon/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tracker@jp343.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "128.0"
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs",
    "alarms",
    "contextMenus",
    "*://*.youtube.com/*",
    "*://*.netflix.com/*",
    "*://*.crunchyroll.com/*",
    "*://*.primevideo.com/*",
    "*://*.amazon.com/*",
    "*://*.amazon.de/*",
    "*://*.amazon.co.jp/*",
    "*://*.amazon.com.br/*",
    "*://*.disneyplus.com/*",
    "*://*.cijapanese.com/*",
    "*://*.nijapanese.com/*",
    "*://*.nihongo-jikan.com/*",
    "*://open.spotify.com/*",
    "*://*.twitch.tv/*",
    "*://app.asbplayer.dev/*",
    "*://jp343.com/*",
    "*://*.jp343.com/*"
  ],
  "content_security_policy": "script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' https: blob: data:; connect-src 'self' https://jp343.com; object-src 'self'",
  "web_accessible_resources": [
    "inject-user-state.js",
    "inject-yt-original-title.js",
    "inject-yt-innertube-title.js",
    "inject-twitch-meta.js"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "jp343 Tracker",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://app.asbplayer.dev/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/asbplayer.js"
      ]
    },
    {
      "matches": [
        "*://*.cijapanese.com/*",
        "*://*.nijapanese.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/cijapanese.js"
      ]
    },
    {
      "matches": [
        "*://*.crunchyroll.com/*"
      ],
      "all_frames": true,
      "run_at": "document_idle",
      "js": [
        "content-scripts/crunchyroll.js"
      ]
    },
    {
      "matches": [
        "*://*.disneyplus.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/disneyplus-meta.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.disneyplus.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/disneyplus.js"
      ]
    },
    {
      "matches": [
        "*://*.jp343.com/*",
        "*://jp343.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/jp343-bridge.js"
      ]
    },
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/netflix-series-info.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/netflix.js"
      ]
    },
    {
      "matches": [
        "*://*.youtube.com/embed/*"
      ],
      "all_frames": true,
      "run_at": "document_idle",
      "js": [
        "content-scripts/nihongojikan.js"
      ]
    },
    {
      "matches": [
        "*://*.amazon.co.jp/*",
        "*://*.amazon.com.br/*",
        "*://*.amazon.com/*",
        "*://*.amazon.de/*",
        "*://*.primevideo.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/primevideo.js"
      ]
    },
    {
      "matches": [
        "*://open.spotify.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/spotify.js"
      ]
    },
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/twitch.js"
      ]
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/youtube-filter.js",
        "content-scripts/youtube-titles.js",
        "content-scripts/youtube.js"
      ]
    }
  ]
}