Examine source code of Submit All Tabs

{
  "manifest_version": 2,
  "name": "Submit All Tabs",
  "version": "1.1.1",
  "description": "Submits forms with a specific button on all open tabs.",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "32": "icon32.png"
    },
    "default_title": "Submit Save Button"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f37dc72-0a9b-423d-a750-5e2adec0eedd}",
      "strict_min_version": "113.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.eprocure.gov.bd/*"
      ]
    }
  ]
}