Examine source code of No History

{
  "manifest_version": 2,
  "name": "No History",
  "description": "Temporarily disable browser history.",
  "version": "1.1resigned1",
  "applications": {
    "gecko": {
      "id": "no@histo.ry",
      "strict_min_version": "55.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icon_disabled.png"
  },
  "permissions": [
    "*://*/*",
    "history"
  ]
}