Examine source code of Pirate Replacer

{
    "manifest_version": 2,
    "name": "Pirate Replacer",
    "short_name": "PirateReplace",
    "version": "4.0.0.1",
    //"version_name": "001-release",

    "description": "__MSG_extensionDescription__",
    "default_locale": "en",

    "developer": {
        "name": "Hypothermic IT",
        "url": "https://github.com/hypothermic"
    },
  
    "icons": {
        "48": "icons/ship-48.png",
        "96": "icons/ship-96.png"
    },
  
    "content_scripts": [
        {
            "matches": ["<all_urls>"],
            "js": ["scripts/replace.js"]
        }
    ],

    "incognito": "spanning"
    //"offline_enabled": "true",
}