Examine source code of Histocher

{
  "manifest_version": 2,
  "name": "Histocher",
  "version": "1.1.6",
  "description": "Simple and compact extension helping to search through history",
  "homepage_url": "https://github.com/ismorozs/histocher",
  "icons": {
    "16": "icons/hs16.png",
    "19": "icons/hs19.png",
    "32": "icons/hs32.png",
    "48": "icons/hs48.png",
    "64": "icons/hs64.png",
    "128": "icons/hs128.png"
  },
  "permissions": [
    "history",
    "storage",
    "unlimitedStorage",
    "tabs",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/hs32.png",
    "default_title": "Histocher",
    "default_popup": "popup/index.html"
  },
  "omnibox": {
    "keyword": "h"
  },
  "author": "Igor Morozov",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f7b24fb-eb79-4ecd-a36a-208987e544de}"
    }
  }
}