Examine source code of Download table as CSV

{
  "name": "Download table as CSV",
  "description": "Download HTML tables in MS Excel style CSV format.",
  "version": "1.5",
  "manifest_version": 2,
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "icons/32x32.png",
    "64": "icons/64x64.png",
    "128": "icons/128x128.png"
  }
}