Examine source code of Soil pH Calculator

{
  "manifest_version": 2,
  "name": "Soil pH Calculator",
  "version": "1.0",
  "description": "Soil pH Calculator. This utility helps users calculate soil pH based on measured values ​​from available pH indicators.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/soil-logo.png"
    }
  },
  "icons": {
    "128": "images/soil-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1baf6294-1102-4bf7-9921-32b5ed058116}"
    }
  }
}