Examine source code of Search Keys

{
  "manifest_version": 2,
  "name": "Search Keys",
  "description": "Lets you go to search results by pressing the number of the search result.",
  "homepage_url": "https://github.com/nth10sd/search-keys.git",
  "version": "2.1.1resigned1",
  "icons": {
    "32": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "searchkeys.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{003dc6ae-2505-4639-be60-9132ac0d8814}"
    }
  }
}