Remove "experimental" comment.
Remove "experimental" comment.

I think we can safely remove this comment now, @mrmr1993.  This is
working out very nicely.

bkudria/vimium,philc/vimium,gdh1995/vimium,hhsue/vimium,zhangmin510/vimium,justalittlenoob/vimium,poacher2k/vimium,elderbas/vimium,VPashkov/vimium,dimatter/vimium,elegantwww/vimium,Robinson10240/vimium,borgified/vimium,tuchangwei/vimium,hhsue/vimium,tuchangwei/vimium,Aleroniponi/vimium,mrmr1993/vimium,gdh1995/vimium,csmalin/vimium,douglas-larocca/vimium,dimatter/vimium,Robinson10240/vimium,tuchangwei/vimium,dimatter/vimium,cyrixhero/vimium,elderbas/vimium,Lw-Cui/vimium,hhsue/vimium,csmalin/vimium,decaffeinate-examples/vimium,elderbas/vimium,PickRelated/vimium,PrestanceDesign/vimium,PrestanceDesign/vimium,douglas-larocca/vimium,cyrixhero/vimium,cyrixhero/vimium,philc/vimium,PickRelated/vimium,borgified/vimium,PickRelated/vimium,mrmr1993/vimium,gdh1995/vimium,VPashkov/vimium,bkudria/vimium,justalittlenoob/vimium,elegantwww/vimium,poacher2k/vimium,willsALMANJ/vimium,VPashkov/vimium,bkudria/vimium,willsALMANJ/vimium,mrmr1993/vimium,smblott-github/vimium,Robinson10240/vimium,csmalin/vimium,douglas-larocca/vimium,Aleroniponi/vimium,zhangmin510/vimium,Lw-Cui/vimium,decaffeinate-examples/vimium,borgified/vimium,Lw-Cui/vimium,smblott-github/vimium,Aleroniponi/vimium,philc/vimium,justalittlenoob/vimium,PrestanceDesign/vimium,smblott-github/vimium,willsALMANJ/vimium,poacher2k/vimium,zhangmin510/vimium,decaffeinate-examples/vimium,elegantwww/vimium