webRequest API可能就是你需要的，这段代码放在你的后台页面：

  chrome.webRequest.onBeforeRequest.addListener（
函数（详情）{
 if（details.url ==http://www.google.com/ ）
 return {redirectUrl：http://www.google.com/?q=defaultquery}; 
}，
 {url：[http://www.google .com / *]}，
 [blocking]）; 
 

这是一个非常具体的规则，通过 http://www.google.com/?q将访问重定向到 http://www.google.com/ = defaultquery ，但我认为你可以看到如何将其扩展到incl ude更多功能。

请注意，这将重新路由所有尝试达到 http://www.google.com / code>，包括Ajax请求和iframe。

根据文档，您需要添加 webRequest 和 webRequestBlocking 权限，以及您计划拦截的每个主机的主机权限：

 permissions：[
webRequest，
webRequestBlocking，
*：//*.google.com/，
。 .. 
]，
 

I am trying to append few extra parameters to the url that user typed (before the page gets loaded). Is it possible to do?

For example, if user types www.google.com, I would like to append ?q=query to url (final: www.google.com?q=query.

Thanks

The webRequest API might be what you need. This code goes in your background page:

chrome.webRequest.onBeforeRequest.addListener(
    function(details) {
        if( details.url == "http://www.google.com/" )
            return {redirectUrl: "http://www.google.com/?q=defaultquery" };
    },
    {urls: ["http://www.google.com/*"]},
    ["blocking"]);

This is an extremely specific rule that redirects visits to http://www.google.com/ with http://www.google.com/?q=defaultquery, but I think you can see how to expand it to include more functionality.

Note that this will reroute all attempts to reach http://www.google.com/, including Ajax requests and iframes.

Per the documentation, you will need to add the webRequest and webRequestBlocking permissions, along with host permissions for every host you plan to intercept:

"permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.google.com/",
    ...
],