three.js - WebGL: Offscreen buffers were not cleared before new rendering? -

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i'm making kind of web-apps using three.js.

so far, apps work fine, however, when see them in friend's computer, 3d graphics' canvas blinks , copied(?) objects found.
(i wanted paste example didn't have enough reputation upload images...)

i think because images drawn on off-screen-buffer 1 several frames before not cleared correctly.
when changed webgl.force-layers-readback 'true' in about:config (i using firefox28), apps fine.

(with computer, looks ok if webgl.force-layers-readback 'false'.)

could tell why happened , how avoid it?
want avoid in application side because don't want tell every visitors change options true.

environment
friend's
os: windows 8
browser: firefox28
graphics card: intel hd graphics 4600

mine
os: windows 8
browser: firefox28
graphics card: intel hd graphics 4000

hope understand want say. i'm not @ english.>_<

it because obsolete graphic drivers....

sorry bothering.>_<


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