Examine source code of workspace-manager

{
  "manifest_version": 2,
  "name": "workspace-manager",
  "version": "1.0.1",
  "description": "A workspace manager.",
  "icons": {
    "48": "icons/wsp-48.png",
    "96": "icons/wsp-96.png"
  },
  "permissions": [
    "tabs",
    "tabHide",
    "storage",
    "menus",
    "cookies"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/wsp-16.png",
      "32": "icons/wsp-32.png",
      "64": "icons/wsp-64.png"
    },
    "default_title": "Workspaces",
    "default_popup": "popup/wsp.html"
  },
  "background": {
    "scripts": [
      "backend/storage.js",
      "backend/workspace.js",
      "backend/brainer.js",
      "backend/handler.js",
      "backend/util.js"
    ]
  }
}