Examine source code of MasquerBarreOnglets

{
  "manifest_version": 2,
  "name": "MasquerBarreOnglets",
  "version": "1.0",
  "description": "Une extension pour masquer la barre des onglets.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.jpg",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.jpg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f03c58d-1400-431a-bedf-f9b2935252a1}"
    }
  }
}