Examine source code of LeetFonts

{
  "manifest_version": 2,
  "name": "LeetFonts",
  "version": "1.0.1",
  "description": "Change LeetCode's editor font easily.",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "leetfonts@leetfonts.vunat.in",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://leetcode.com/*",
        "*://*.leetcode.com/*"
      ],
      "js": [
        "fontStyles.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_title": "LeetFonts",
    "default_popup": "popup/popup.html"
  }
}