Examine source code of Mobile Dyslexic

{
  "manifest_version": 2,
  "name": "Mobile Dyslexic",
  "description": "Mobile Dyslexic replaces all fonts of all web pages with carefully crafted special font which is easier to read by people with dyslexia.",
  "version": "0.0.6",
  "author": "Jari Eskelinen <jari.eskelinen@iki.fi>",
  "applications": {
    "gecko": {
      "id": "@mobiledyslexic",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icons/mobiledyslexic-48.png",
    "96": "icons/mobiledyslexic-96.png"
  },
  "web_accessible_resources": [
    "css/mobiledyslexic.css"
  ],
  "browser_action": {
    "default_icon": "icons/mobiledyslexic-on.png",
    "default_title": "Dyslexic: On"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "content-script.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start"
    }
  ]
}