Getting an Xss-Checker alert in website

When loading one of our sites, fcnews.net we get an alert box for Xss-Checker. When switching the theme to something else, the alert does not happen. I’m not sure if this is a built in security checker, or something else, but it just came on out of no where and I don’t know where to locate it.

Thank you, I’ve used the plugin suggested to clean the malware, however, I’m still seeing the XSS-Checker alert. Any idea where this could be coming from?

Check your index.php and the wp-blog-header for a malware code. You can compare the file you have in your installation with a clean file from the wordpress download. To remore malware just change the content to the clean file

I did not. I was able to clean up the malware in the site but I’m still getting the XSS-Checker alert.

What do you mean by an extra plugin? I’m not using any plugins that would interfere with the theme. Is this coded into the theme? When I change themes, I don’t get the alert. Do you know if this is some security measure in the code, and where would I be able to find it? I’ve been looking, but I need help finding where the source of it could be coming from.

I just need my question answered, our time does not line up and getting 1 response a day isn’t working out. This is a paying client of ours that we could potentially lose over this issue that is associated with your theme.