Examine source code of Plain Text Linker

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "jid1-CeHl9T9miaoK2w@jetpack"
    }
  },
  "name": "Plain Text Linker",
  "short_name": "PTL",
  "version": "2.5.3",
  "description": "Opens plain text URLs when you double-click on them.",
  "author": "marnick.leau@gmail.com",
  "icons": {
    "16": "/images/icon-16.png",
    "48": "/images/icon-48.png",
    "128": "/images/icon-128.png"
  },
  "options_ui": {
    "page": "/options.html",
    "chrome_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "/background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "notifications",
    "<all_urls>"
  ]
}