Examine source code of simplelunar

{
  "manifest_version": 2,
  "name": "lunar",
  "version": "1.1resigned1",
  "description": "Adds a button to browser to show lunar",
  "icons": {
    "48": "icons/lunar-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": "icons/lunar-48.png",
    "default_title": "lunar",
    "default_popup": "popup/lunar.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{97f2d6a1-2f80-486c-8a55-b5693482c01d}"
    }
  }
}