Examine source code of Devoweb Tools

{
  "manifest_version": 2,
  "name": "Devoweb Tools",
  "version": "1.0",
  "description": "Extension de raccourcis d'outils divers pour le développement web",
  "author": "Devoweb",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "src/icons/32-devoweb.png",
      "32": "src/icons/32-devoweb.png",
      "48": "src/icons/32-devoweb.png"
    }
  },
  "icons": {
    "16": "src/icons/32-devoweb.png",
    "32": "src/icons/32-devoweb.png",
    "48": "src/icons/32-devoweb.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ef042148-b62a-4f2e-b4df-0284445cab16}"
    }
  }
}