added window context check before trying to .close() (bug 708609)
added window context check before trying to .close() (bug 708609)

Revanth47/addons-server,koehlermichael/olympia,yfdyh000/olympia,crdoconnor/olympia,spasovski/zamboni,mstriemer/zamboni,eviljeff/zamboni,beni55/olympia,harry-7/addons-server,aviarypl/mozilla-l10n-addons-server,wagnerand/addons-server,mstriemer/zamboni,muffinresearch/olympia,jpetto/olympia,Jobava/zamboni,anaran/olympia,wagnerand/addons-server,mrrrgn/olympia,mozilla/addons-server,washort/zamboni,wagnerand/addons-server,clouserw/zamboni,ingenioustechie/zamboni,mudithkr/zamboni,anaran/olympia,atiqueahmedziad/addons-server,ingenioustechie/zamboni,muffinresearch/olympia,mdaif/olympia,Joergen/zamboni,yfdyh000/olympia,bqbn/addons-server,andymckay/zamboni,crdoconnor/olympia,robhudson/zamboni,wagnerand/zamboni,ddurst/zamboni,Nolski/olympia,clouserw/zamboni,ddurst/zamboni,Jobava/zamboni,psiinon/addons-server,mstriemer/olympia,Nolski/olympia,psiinon/addons-server,crdoconnor/olympia,aviarypl/mozilla-l10n-addons-server,ddurst/zamboni,Revanth47/addons-server,jamesthechamp/zamboni,wagnerand/addons-server,anaran/olympia,Joergen/olympia,spasovski/zamboni,kumar303/zamboni,diox/zamboni,kumar303/zamboni,mstriemer/addons-server,johancz/olympia,mrrrgn/olympia,wagnerand/olympia,mozilla/addons-server,shahbaz17/zamboni,andymckay/olympia,eviljeff/olympia,kumar303/addons-server,johancz/olympia,kumar303/olympia,harry-7/addons-server,lavish205/olympia,johancz/olympia,jpetto/olympia,kumar303/olympia,robhudson/zamboni,kmaglione/olympia,kumar303/zamboni,diox/zamboni,mstriemer/zamboni,wagnerand/zamboni,tsl143/addons-server,kumar303/addons-server,Hitechverma/zamboni,wagnerand/zamboni,wagnerand/zamboni,yfdyh000/olympia,ingenioustechie/zamboni,diox/zamboni,elysium001/zamboni,diox/olympia,jamesthechamp/zamboni,robhudson/zamboni,wagnerand/olympia,mozilla/zamboni,muffinresearch/addons-server,tsl143/zamboni,wagnerand/olympia,kmaglione/olympia,koehlermichael/olympia,Joergen/zamboni,luckylavish/zamboni,muffinresearch/addons-server,mozilla/addons-server,shahbaz17/zamboni,muffinresearch/olympia,elysium001/zamboni,mstriemer/addons-server,jpetto/olympia,mozilla/olympia,muffinresearch/olympia,shahbaz17/zamboni,Nolski/olympia,spasovski/zamboni,aviarypl/mozilla-l10n-addons-server,jasonthomas/zamboni,Witia1/olympia,mudithkr/zamboni,mstriemer/olympia,psiinon/addons-server,mozilla/olympia,magopian/olympia,muffinresearch/addons-server,elysium001/zamboni,tsl143/zamboni,beni55/olympia,crdoconnor/olympia,yfdyh000/olympia,muffinresearch/olympia,washort/zamboni,ingenioustechie/zamboni,mdaif/olympia,harry-7/addons-server,mrrrgn/olympia,Prashant-Surya/addons-server,Revanth47/addons-server,eviljeff/zamboni,mozilla/addons-server,crdoconnor/olympia,Witia1/olympia,mstriemer/olympia,Jobava/zamboni,mudithkr/zamboni,atiqueahmedziad/addons-server,kumar303/zamboni,ngokevin/zamboni,mrrrgn/olympia,eviljeff/zamboni,Witia1/olympia,andymckay/olympia,Jobava/zamboni,mozilla/olympia,andymckay/addons-server,harry-7/addons-server,mdaif/olympia,Joergen/zamboni,Joergen/olympia,johancz/olympia,magopian/olympia,eviljeff/olympia,luckylavish/zamboni,kumar303/addons-server,magopian/olympia,mozilla/zamboni,beni55/olympia,koehlermichael/olympia,Witia1/olympia,diox/zamboni,andymckay/olympia,harikishen/addons-server,magopian/olympia,ayushagrawal288/zamboni,clouserw/zamboni,muffinresearch/addons-server,wagnerand/olympia,kumar303/olympia,washort/zamboni,koehlermichael/olympia,psiinon/addons-server,andymckay/zamboni,kmaglione/olympia,SuriyaaKudoIsc/olympia,beni55/olympia,luckylavish/zamboni,diox/olympia,Joergen/olympia,jasonthomas/zamboni,johancz/olympia,tsl143/addons-server,ayushagrawal288/zamboni,beni55/olympia,mstriemer/olympia,mstriemer/addons-server,Prashant-Surya/addons-server,tsl143/addons-server,SuriyaaKudoIsc/olympia,Joergen/zamboni,Joergen/zamboni,washort/zamboni,tsl143/zamboni,Joergen/olympia,Prashant-Surya/addons-server,spasovski/zamboni,Nolski/olympia,muffinresearch/addons-server,robhudson/zamboni,kumar303/addons-server,clouserw/zamboni,harikishen/addons-server,Hitechverma/zamboni,mozilla/zamboni,mozilla/zamboni,andymckay/addons-server,ayushagrawal288/zamboni,mdaif/olympia,harikishen/addons-server,jamesthechamp/zamboni,kumar303/olympia,Joergen/zamboni,kmaglione/olympia,jamesthechamp/zamboni,mrrrgn/olympia,bqbn/addons-server,atiqueahmedziad/addons-server,luckylavish/zamboni,mstriemer/addons-server,mudithkr/zamboni,aviarypl/mozilla-l10n-addons-server,Joergen/olympia,andymckay/zamboni,andymckay/addons-server,yfdyh000/olympia,bqbn/addons-server,jasonthomas/zamboni,atiqueahmedziad/addons-server,ngokevin/zamboni,magopian/olympia,Hitechverma/zamboni,diox/olympia,kmaglione/olympia,eviljeff/olympia,harikishen/addons-server,jpetto/olympia,tsl143/zamboni,eviljeff/zamboni,lavish205/olympia,eviljeff/olympia,Hitechverma/zamboni,ngokevin/zamboni,andymckay/olympia,andymckay/addons-server,lavish205/olympia,mdaif/olympia,SuriyaaKudoIsc/olympia,ayushagrawal288/zamboni,shahbaz17/zamboni,elysium001/zamboni,ddurst/zamboni,SuriyaaKudoIsc/olympia,tsl143/addons-server,mstriemer/zamboni,bqbn/addons-server,mozilla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