Examine source code of GitHub Repo Size

{
  "manifest_version": 3,
  "name": "GitHub Repo Size",
  "author": "mouiylus@gmail.com",
  "description": "Show size summaries of GitHub repos",
  "version": "0.2.7",
  "web_accessible_resources": [
    {
      "resources": [
        "script.js"
      ],
      "matches": [
        "https://github.com/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "css": [
        "content.css"
      ]
    }
  ],
  "action": {
    "default_popup": "index.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "github-repo-size@gmail.com",
      "strict_min_version": "42.0"
    }
  }
}