You can do this with browsermob-proxy . Once you have installed this, you simply install the proxy server and set up the blacklist.
ProxyServer server = new ProxyServer(9000)
server.start();
final DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(CapabilityType.PROXY, server.seleniumProxy());
server.blacklistRequests("http://.*\\.fbcdn.net/.*", 200);
WebDriver driver = new SomeDriverImpl(capabilities);
, python ( ):
from browsermobproxy import Server
server = Server("path/to/browsermob-proxy")
server.start()
proxy = server.create_proxy()
proxy.blacklist('http://.*\\.fbcdn.net/.*', 200)
from selenium import webdriver
profile = webdriver.FirefoxProfile()
profile.set_proxy(proxy.selenium_proxy())
driver = webdriver.Firefox(firefox_profile=profile)
...
proxy.stop()
driver.quit()