Examine source code of Foxus - Focus Mode for X

{
  "manifest_version": 2,
  "name": "Foxus - Focus Mode for X",
  "description": "Stop doom-scrolling. Focus on one tweet at a time with a cinematic blur effect.",
  "version": "1.0.0",
  "short_name": "Foxus",
  "icons": {
    "16": "/icon/icon-16.png",
    "48": "/icon/icon-48.png",
    "128": "/icon/icon-128.png"
  },
  "permissions": [
    "storage",
    "*://*.x.com/*",
    "*://*.twitter.com/*"
  ],
  "web_accessible_resources": [
    "foxus.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "foxus-extension@nman1github.com",
      "strict_min_version": "120.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Foxus Settings",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}