Examine source code of MUA Web Unicode Converter

{
  "manifest_version": 2,
  "name": "MUA Web Unicode Converter",
  "description": "This extension will check web content and convert to Unicode encoded text if they are Zawgyi.",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "version": "1.21",
  "applications": {
    "gecko": {
      "id": "@mua-converter",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "icon19.png",
      "38": "icon38.png"
    },
    "default_popup": "popup.html",
    "default_title": "Click here!"
  },
  "content_scripts": [
    {
      "css": [
        "zawgyi.css"
      ],
      "js": [
        "parabaik.js",
        "converter.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "YoeYar-One.ttf",
    "pyidaungsu-1-3.ttf"
  ],
  "permissions": [
    "activeTab",
    "storage"
  ]
}