I know that you have to put code in background.js for it to work, obviously. For example, if I wanted to block all requests starting with "facebook.com/s/", how would I do this? I've been looking everywhere on how to do this but to no avail. Code:

chrome.webRequest.onBeforeSendHeaders.addListener(function(details){
    console.log(details);
    
    if(details.url.startsWith("https://www.facebook.com/s/"))
    {
        return{cancel:true};
    }

},{urls: ['<all_urls>']},['blocking', 'requestHeaders']);