Examine source code of SinhalaUnicode

{
  "manifest_version": 2,
  "name": "SinhalaUnicode",
  "version": "1.2resigned1",
  "description": "Allows the user to translate Singlish to Sinhala unicode.",
  "icons": {
    "48": "icons/icon.png"
  },
  "applications": {
    "gecko": {
      "id": "sinhala_unicode@lasith.com",
      "strict_min_version": "42.0",
      "strict_max_version": "50.*"
    }
  },
  "permissions": [
    "clipboardWrite",
    "clipboardRead"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon.png"
    },
    "default_title": "SinhalaUnicode",
    "default_popup": "popup/sinhala_unicode.html"
  }
}