Examine source code of Regex History Filter

{
  "manifest_version": 2,
  "name": "Regex History Filter",
  "description": "Use regex rules to manage browsing history.",
  "version": "0.1.10",
  "icons": {
    "16": "icons/logo/filter.svg",
    "32": "icons/logo/filter.svg",
    "64": "icons/logo/filter.svg",
    "128": "icons/logo/filter.svg"
  },
  "applications": {
    "gecko": {
      "id": "{71ba0d7a-d9ab-4a35-928c-a2bf9b857127}",
      "strict_min_version": "59.0a1"
    }
  },
  "background": {
    "scripts": [
      "js/test.js",
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "history",
    "storage"
  ]
}