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manifest.json
{
  "manifest_version": 2,
  "name": "How much have I earned?",
  "description": "This extension will tell you how much you've earned in real-time from your job today",
  "version": "1.1.0",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "calc.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fd129783-fb8c-4060-820a-5ea542bba2fc}"
    }
  }
}