Examine source code of simplePage

{
  "manifest_version": 2,
  "name": "simplePage",
  "version": "1.0.1resigned1",
  "description": "Make simple pages more readable",
  "icons": {
    "48": "icons/simplePage.svg"
  },
  "background": {
    "scripts": [
      "dist/simplePage.js"
    ]
  },
  "page_action": {
    "default_icon": "icons/simplePage.svg",
    "default_title": "Simplify page style",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "cookies",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2a939369-e4d5-4594-9ed2-4f42b1ac6291}"
    }
  }
}