Examine source code of EasyXScreenshot

{
  "manifest_version": 2,
  "name": "EasyXScreenshot",
  "version": "1.0.1",
  "description": "Take screenshot of currently open X post.",
  "homepage_url": "https://github.com/erton26/EasyXScreenshot",
  "icons": {
    "48": "icons/EXSS48.png",
    "128": "icons/EXSS128.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/EXSS48.png",
    "default_title": "Take Screenshot!"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{85e488ba-6483-4077-8f4e-557343afba88}"
    }
  }
}