Examine source code of Substack Tools

{
  "manifest_version": 2,
  "name": "Substack Tools",
  "version": "0.0.11",
  "description": "Substack tooling suite for creators and readers",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7518936b-0fcc-435f-ae36-52d30dbfbdc8}",
      "strict_min_version": "42.0"
    }
  },
  "author": "Guilherme Campos",
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js",
        "footnote-preview.js"
      ],
      "css": [
        "footnote-preview.css"
      ],
      "run_at": "document_start"
    }
  ],
  "homepage_url": "https://substacktools.com",
  "incognito": "spanning"
}