Add "Mark All Read" button to GMail

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "manifest_version": 2,
    "content_scripts": [
        {
            "exclude_globs": [],
            "exclude_matches": [],
            "include_globs": [
                "https:\/\/mail.google.com\/mail*"
            ],
            "js": [
                "script.js"
            ],
            "matches": [
                "http:\/\/*\/*",
                "https:\/\/*\/*"
            ],
            "run_at": "document_end"
        }
    ],
    "converted_from_user_script": true,
    "description": "Allows you to mark all messages as read with one click.",
    "name": "Add \"Mark All Read\" button to GMail",
    "version": "1.3"
}