Examine source code of Simple Swipe Navigator

{
  "manifest_version": 2,
  "name": "Swipe Navigator",
  "version": "1.6",
  "description": "Enables horizontal swipes for Back/Forward navigation on mobile devices.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>",
        "file://*/*"
      ],
      "js": [
        "js/swipe.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f3ab763-a4c2-4183-b596-984bf5b7ac31}"
    }
  }
}