Examine source code of Edit Anything

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Edit Anything",
  "version": "0.2",
  "browser_action": {
    "default_icon": "pencil-64x64.png"
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "permissions": [
    "activeTab"
  ]
}