Examine source code of saveTabs

{
  "manifest_version": 2,
  "name": "saveTabs",
  "version": "1.1resigned1",
  "description": "Save the open tabs",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "save@saveTabs"
    }
  },
  "icons": {
    "48": "icons/saveTabs.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "tabstrip",
    "default_icon": "icons/saveTabs.png"
  },
  "author": "caspgin"
}