Examine source code of Font Weight Adjuster

{
  "manifest_version": 2,
  "name": "Font Weight Adjuster",
  "version": "1.0",
  "description": "Allows users to adjust font weights for headers and body text on the current webpage.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png",
    "default_title": "Font Weight Adjuster"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{11683413-8c39-44a1-84ad-2290eec4744a}"
    }
  }
}