Examine source code of Reading Mode Enhancer

{
  "manifest_version": 2,
  "name": "Reading Mode Enhancer",
  "version": "1.0",
  "description": "Automatically opens Reader Mode on long-text pages.",
  "applications": {
    "gecko": {
      "id": "{c70d414f-3695-4986-8664-1c59c94179ec}",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Read Mode Enhancer"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}