Chromium browser will display an icon in the address bar if a script is blocked on a website. In the screenshot above, I set Chromium to block all images on web sites. On Google’s homepage the Vancouver Olympic image is blocked and the icon in the red block says exactly that.
If you’re brave enough yo try Chromium Daily Builds, then drop this in your Software Sources; ppa:chromium-daily/ppa
sudo add-apt-repository ppa:chromium-daily/ppa
sudo apt-get update
sudo apt-get install chromium-browser.