I was browsing the store when this happened:

(Browser is now unresponsive)

This has happened a few times now. Changing to the library tab and back fixes it, but after scrolling for a while it usually happens again.

System info:

Processor Information:
    Vendor:  AuthenticAMD
    CPU Family:  0x15
    CPU Model:  0x2
    CPU Stepping:  0x0
    CPU Type:  0x0
    Speed:  4013 Mhz
    8 logical processors
    8 physical processors
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Supported
    SSE41:  Supported
    SSE42:  Supported

Network Information:
    Network Speed:  

Operating System Version:
    Ubuntu 14.04.1 LTS (64 bit)
    Kernel Name:  Linux
    Kernel Version:  3.13.0-35-generic
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11501000
    X Window Manager:  Compiz
    Steam Runtime Version:  steam-runtime-release_2014-08-20

Video Card:
    Driver:  NVIDIA Corporation GeForce GTX 660/PCIe/SSE2

    Driver Version:  4.4.0 NVIDIA 340.24
    OpenGL Version: 4.4
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    VendorID:  0x10de
    DeviceID:  0x11c0
    Number of Monitors:  2
    Number of Logical Video Cards:  2
    Primary Display Resolution:  1920 x 1080
    Desktop Resolution: 3840 x 1080
    Primary Display Size: 20.91" x 11.77"  (23.98" diag)
                                            53.1cm x 29.9cm  (60.9cm diag)
    Primary Bus: PCI Express 16x
    Primary VRAM: 2048 MB
    Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
    Audio device: Realtek ALC898

Memory:
    RAM:  15946 Mb

Miscellaneous:
    UI Language:  English
    LANG:  en_GB.UTF-8
    Microphone:  Not set
    Total Hard Disk Space Available:  884538 Mb
    Largest Free Hard Disk Block:  234018 Mb

Installed software:

Recent Failure Reports: