Examine source code of Half Bold

{
  "manifest_version": 2,
  "name": "Half Bold",
  "version": "1.0",
  "description": "A tool to help people with ADHD improve their reading focus and comprehension.",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js",
        "popup.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{39792901-7786-4d20-97d0-1eb2f50aca85}"
    }
  }
}