Examine source code of BMI Calculator-extension

{
  "manifest_version": 2,
  "name": "BMI Calculator",
  "author": "Srinivas R",
  "short_name": "Nivaz",
  "description": "A simple and BMI Calculator extension! Coded by Nivaz",
  "version": "1.0",
  "homepage_url": "https://github.com/Nivas7/Addons",
  "browser_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "64": "icons/icon64.png"
    },
    "default_title": "BMI Calculator",
    "default_popup": "index.html"
  },
  "icons": {
    "48": "icons/icon48.png",
    "64": "icons/icon64.png"
  },
  "page_action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "64": "icons/icon64.png"
    },
    "default_title": "BMI Calculator",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{34a28a8d-e900-449e-8e2c-188137c68055}"
    }
  }
}