Round arrow directly to the left of the address bar.
If there is a X there it means it's still loading the page, it will turn into a round arrow when it's finished, or you can click the X to stop it loading the page and then click the round arrow.
I currently have little squares all over my Facebook Page courtesy of google chrome, these squares have numbers top and bottom on Mozilla. If anyone has any ideas how I can get rid I would really appreciate it.....