Examine source code of Special Char Remover

{
  "manifest_version": 2,
  "name": "SpecialCharRemover",
  "version": "2.0",
  "description": "Removes special character from the number in the form",
  "icons": {
    "48": "icons/file-list-7.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/file-list-7.png",
    "default_title": "SpecialCharRemover"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "form.js"
      ]
    }
  ]
}