If you use Debian like me, and if you want to read wsj.com, you will have noticed that the pages don't render well: lots of white space before article text begins. wsj.com doesn't recognise that iceweasel is really firefox. It's easy to fix. You should install the firefox extension called User Agent Switcher, and then make a new entry. Copy every field from the default setting. I call the new setting "firefox". In the "firefox" setting, edit the field "User Agent". Go the the end of the string and put the word "firefox" (without the quotes). That's it. I've told the wsj team about this silly browser detection, but they show no urgency in the simple fix they need to make.