Its happening on windows as well
http://store.steampowered.com/browse/linux/ appears broken in browsers.
Yeah I can duplicate this issue on all browsers and my linux client.
I can reproduce it here with Google Chrome.
The web team is looking into it. Closing as this is not a Linux issue and will be handled in the regular Steam forums,
Nothing extracted yet.
After the last update, when I click on the Linux tab, something strange happens, as you can see on the image attached.
My specs: https://gist.github.com/Lord-Avallon/4521727