Examine source code of RossEnCube

{
  "manifest_version": 2,
  "author": "Bilou",
  "name": "RossEnCube",
  "description": "Notifie quand la vedette arrive en live",
  "version": "1.0.9resigned1",
  "browser_action": {
    "default_icon": "ross128.png",
    "default_title": "Click pour rejoindre la vedette !"
  },
  "icons": {
    "16": "ross16.png",
    "32": "ross32.png",
    "48": "ross48.png",
    "128": "ross128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{051da350-3efb-4948-8b1f-96d47118e513}"
    }
  }
}