[Bug 744808]

[U494960]

Solution is here: www.waveguide.se/?article=speed-up-that-sluggish-iceweasel-firefox
Works for me, no lags at now.

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Manjaro Linux (XFCE, kernel 4.1.3)
Nvidia 304.125
Firefox 39

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https://bugs.launchpad.net/bugs/744808

Title:
  image sprite is packed very asymmetrically - triggers poor rendering
  performance in firefox3 and missing icons in firefox4 and konquerer

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