Examine source code of Poplingo

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "2.5.10",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "zh_CN",
  "permissions": [
    "storage",
    "contextMenus",
    "declarativeNetRequest",
    "downloads",
    "alarms",
    "tabs",
    "identity",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "poplingo@leoku.dev",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": []
      }
    }
  },
  "web_accessible_resources": [
    "logo.svg",
    "logo-simple.svg",
    "assets/tailwind.css"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "browser_style": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "run_at": "document_end",
      "js": [
        "content-scripts/compose.js",
        "content-scripts/content.js",
        "content-scripts/floating-button.js",
        "content-scripts/fullpage.js",
        "content-scripts/image-translation.js",
        "content-scripts/link-preview.js",
        "content-scripts/paragraph.js",
        "content-scripts/selection-popup.js"
      ],
      "match_origin_as_fallback": true
    },
    {
      "matches": [
        "https://twitter.com/*",
        "https://x.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "content-scripts/twitter.js"
      ]
    },
    {
      "matches": [
        "https://www.youtube-nocookie.com/*",
        "https://www.youtube.com/*",
        "https://youtu.be/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content-scripts/youtube-bridge.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "https://www.youtube-nocookie.com/*",
        "https://www.youtube.com/*",
        "https://youtu.be/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "css": [
        "content-scripts/youtube-subtitle.css"
      ],
      "js": [
        "content-scripts/youtube-subtitle.js"
      ]
    }
  ]
}