Select default From sender in Gmail

{
    "update_url": "http:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "Select default From sender in Gmail",
    "description": "Allows you to preset the default From address in Gmail with a parameter called bu. For example https:\/\/mail.google.com\/mail\/?bu=...",
    "manifest_version": 2,
    "version": "1.3",
    "content_scripts": [
        {
            "js": [
                "gmail_default_sender.js"
            ],
            "matches": [
                "*:\/\/mail.google.com\/mail\/*bu*"
            ],
            "exclude_matches": [
                "*:\/\/mail.google.com\/mail\/help\/"
            ]
        }
    ],
    "icons": {
        "128": "icon128.png"
    }
}