do not show featured add-ons already installed (bug 643617)
do not show featured add-ons already installed (bug 643617)

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