Examine source code of AlphaRune

{
  "manifest_version": 2,
  "name": "AlphaRune",
  "version": "1.3",
  "description": "Browser extension to convert the Latin alphabet to and from runes",
  "homepage_url": "https://github.com/Onyxqk/alpharune",
  "icons": {
    "48": "alpharune.png"
  },
  "browser_action": {
    "default_icon": "alpharune.png",
    "default_title": "AlphaRune",
    "default_popup": "index.html"
  }
}