Examine source code of Github Aid - repo file size

{
  "manifest_version": 3,
  "name": "Github Aid - displays repo file sizes",
  "short_name": "Github Aid",
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "./js/content_script_extension_adapter.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*.js"
      ],
      "matches": [
        "*://github.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "github_aid@temp.com"
    }
  },
  "icons": {
    "16": "./icon/eldercat_16.png",
    "32": "./icon/eldercat_32.png",
    "48": "./icon/eldercat_48.png",
    "64": "./icon/eldercat_64.png",
    "128": "./icon/eldercat_128.png",
    "256": "./icon/eldercat_256.png"
  },
  "options_ui": {
    "page": "./html/option.html",
    "open_in_tab": false
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "action": {
    "default_icon": {
      "16": "./icon/eldercat_16.png",
      "32": "./icon/eldercat_32.png",
      "48": "./icon/eldercat_48.png",
      "64": "./icon/eldercat_64.png",
      "128": "./icon/eldercat_128.png",
      "256": "./icon/eldercat_256.png"
    },
    "default_popup": "./html/option.html",
    "default_title": "Github Aid"
  },
  "author": "Omar Azmi",
  "version": "0.1.2",
  "description": "Displays github repository file and folder sizes. Supports GraphQL and REST api modes. Also mobile friendly.",
  "homepage_url": "https://github.com/omar-azmi/github_aid_ts"
}