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google chrome, close tab event listener
chrome.tabs.onRemoved.addListener(function (tabId) {
   alert(tabId);
});

{
"name": "WebHistory Extension",
"version": "1.0",
"manifest_version": 2,
"description": "storing webhistory",
    "content_scripts":[
        {
            "matches": ["http://*/*"],
            "js": ["jquery-1.7.min.js","myscript.js"],
            "run_at": "document_end"
        }
    ],
    "permissions" : ["tabs"]
}