[嗨，我正在开发Chrome扩展程序，它基本上是一个计时器，当我点击扩展程序并启动计时器时一旦我关闭扩展程序弹出窗口，然后再次打开，就好像重新加载了扩展程序页面一样。但我希望计时器继续在后台运行，请咨询我的清单文件：
{
"manifest_version": 2,
"name": "Study Mate",
"description": "Using the old conccept of Pomorodo Timer study method we have this new extension for you ",
"version":"1.0.0",
"icons":{"128": "icon_128.png"},
"browser_action" : {
"default_icon" : "icon.png",
"default_popup": "index.html"
},
"permissions":["activeTab"]
}