Examine source code of AK - StockClicker

{
  "manifest_version": 2,
  "name": "Stock_Clicker",
  "version": "1.2",
  "author": "Vahid - +989190592373",
  "description": "This addon helps you to auto Click on desired area of the page. Take cursor to the point you want click and hold 'X' button. Note that all Inputs and Textareas should be unfocused already.",
  "icons": {
    "48": "ak_logo.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "StockClicker.js"
      ]
    }
  ]
}