Examine source code of hili

{
  "description": "Highlight",
  "manifest_version": 2,
  "name": "hili",
  "version": "1.4.1",
  "homepage_url": "https://github.com/frnsys/hili",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "hili.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "<all_urls>",
    "contextMenus",
    "notifications",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "hili@publicscience.co"
    }
  }
}