I have been investigating various different ways of adding Twitter, Facebook, AddThis, etc., features to my website. The standard Twitter connection means adding:to the page. This seems to work fine for me in Epiphany, Firefox, and Chromium. Using AddThis means adding: to the page. With Epiphany everything seems to work fine. However with Firefox and Chromium the page downloads fine but nothing after this line renders. I have tried all combinations, and repeated, and I can be very confident that this line is causing these browser to not render anything else below it. I am using Ubuntu 10.10 Maverick Meerkat with Firefox 3.16.13 and Chromium 8.0.552.237. If anyone has any ideas on what is going wrong, I'd be grateful.