Examine source code of History deleter

{
  "manifest_version": 2,
  "name": "History deleter",
  "description": "Gives a popup to list and delete history on a domain.",
  "version": "1.2resigned1",
  "icons": {
    "48": "icons/trash.svg"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "48.0",
      "id": "{4033928d-6481-4e06-80be-a20109db2671}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_title": "History deleter",
    "default_popup": "history.html",
    "default_icon": "icons/trash.svg"
  },
  "permissions": [
    "activeTab",
    "history",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "conspect.js"
      ]
    }
  ]
}