Comment 16 for bug 381650

Coincidentally, I was discussing this privately with someone else a few weeks ago, and suggested pretty much what Vikram has implemented here. :-) The main difference is that I suggested showing the link to the help for your Ubuntu version larger and in bold, with other versions downplayed but still present (in case you're looking up the help for someone else). And if you're not using Firefox or not using Ubuntu, don't chatter about it on the page, just show the help links as help.ubuntu.com does now. (There are all sorts of reasons why you might be using a Windows PC to look up help about Ubuntu.)

Ideally, the User-Agent detection would be done server-side so that it doesn't require JS to be on.