Steam Spring Sale launched

[Mister 44]

Are we looking at the same link?

http://store.steampowered.com/app/200510/

This is odd, in Firefox I get the $9.99, but in Chrome & Steam I get $17.49

Logged in on all 3, so not an account setting.

I get $9.99 everywhere.
Checked on Steam, Chrome, IE and Firefox, both logged in and logged out.

Correct me if I'm wrong, but doesn't Chrome and the Steam client use your windows connection settings while Firefox uses its own custom settings?
This is a bit of a reach, but maybe there is some sort of difference in your settings between FF and windows that confuses steam about your location.