Examine source code of xify

{
  "manifest_version": 3,
  "name": "xify",
  "version": "2.1.5",
  "description": "A firefox addon that modifies twitter or x.com links to vxtwitter/fxtwitter on shortcut Ctrl+Alt+K and copies to clipboard.",
  "permissions": [
    "clipboardWrite",
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://x.com/*"
      ],
      "js": [
        "src/copy.js"
      ]
    }
  ],
  "commands": {
    "modify-link": {
      "suggested_key": {
        "default": "Ctrl+Alt+K",
        "mac": "Command+Alt+K"
      },
      "description": "Copy modified link to clipboard."
    }
  },
  "action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "assets/icon16.png",
      "32": "assets/icon32.png",
      "48": "assets/icon48.png",
      "128": "assets/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "host_permissions": [
    "*://twitter.com/*",
    "*://x.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "xify-firefox-addon@thevenuz"
    }
  },
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "incognito": "spanning"
}