Examine source code of Tweet Capture & Paste

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "version": "1.1",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "commands": {
    "capture-area": {
      "suggested_key": {
        "default": "Ctrl+Alt+D",
        "mac": "Command+Shift+E"
      },
      "description": "Capture selected area as screenshot"
    },
    "paste-all": {
      "suggested_key": {
        "default": "Ctrl+Alt+V",
        "mac": "Command+Shift+F"
      },
      "description": "Paste captured screenshots and links into Gmail"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "content-paste.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tweet-capture@labirentmedya.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}