[lib] fix for firefox bug
[lib] fix for firefox bug

vitalsource/director,andradedev/director,sheldonzf/director,webx32/director,stonegithubs/director,meleslilijing/director,kiritoe/director,GerHobbelt/director,lzhengms/director,pandoraui/director,lzhengms/director,fadeit/director,pocketjoso/director,pocketjoso/director,vitalsource/director,mylikes/director,fadeit/director,andradedev/director,cpg1111/director,cpg1111/director,tanzhihang/director,GerHobbelt/director,webx32/director,ks3dev/director,noxryan/director,maxogden/director,tanzhihang/director,kiritoe/director,apeace/director,pandoraui/director,meleslilijing/director,ks3dev/director,mylikes/director,flatiron/director,stonegithubs/director,sheldonzf/director