Examine source code of Kagi Translate

{
  "manifest_version": 2,
  "name": "Kagi Translate",
  "description": "Use Kagi Translate within your browser",
  "version": "0.1.8",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "cookies",
    "scripting",
    "notifications",
    "webNavigation",
    "https://*/*",
    "http://*/*"
  ],
  "default_locale": "en",
  "commands": {
    "translate_page": {
      "suggested_key": {
        "default": "Alt+Shift+T",
        "mac": "Alt+Shift+T"
      },
      "description": "Translate the entire page"
    },
    "translate_selection": {
      "suggested_key": {
        "default": "Alt+T",
        "mac": "Alt+T"
      },
      "description": "Translate selected text"
    },
    "define_selection": {
      "suggested_key": {
        "default": "Alt+D",
        "mac": "Alt+D"
      },
      "description": "Define selected text"
    },
    "proofread_selection": {
      "suggested_key": {
        "default": "Alt+Shift+P",
        "mac": "Alt+Shift+P"
      },
      "description": "Proofread selected text"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Kagi Translate",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": true,
      "js": [
        "content-scripts/content.js"
      ]
    },
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content-scripts/youtube-player-bridge.js"
      ],
      "world": "MAIN"
    }
  ],
  "web_accessible_resources": [
    "content-scripts/content.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd6be57d-91d7-41d2-b61d-3ba20f7942e5}"
    }
  }
}