Make find queries browser-global and persistent.
Make find queries browser-global and persistent.

Closes issue #285.

crazypenguincode/vimium,jb55/vimium-plus,poacher2k/vimium,PrestanceDesign/vimium,mrmr1993/vimium,zhangmin510/vimium,Lw-Cui/vimium,bkudria/vimium,borgified/vimium,philc/vimium,justalittlenoob/vimium,VPashkov/vimium,elegantwww/vimium,douglas-larocca/vimium,PrestanceDesign/vimium,willsALMANJ/vimium,borgified/vimium,mrmr1993/vimium,elderbas/vimium,justalittlenoob/vimium,tuchangwei/vimium,PickRelated/vimium,wildeyes/vimium,poacher2k/vimium,philc/vimium,willsALMANJ/vimium,justalittlenoob/vimium,Lw-Cui/vimium,decaffeinate-examples/vimium,hhsue/vimium,smblott-github/vimium,Lw-Cui/vimium,smblott-github/vimium-smblott,tuchangwei/vimium,bkudria/vimium,VPashkov/vimium,decaffeinate-examples/vimium,mrmr1993/vimium,zhangmin510/vimium,tuchangwei/vimium,cyrixhero/vimium,elegantwww/vimium,gdh1995/vimium,douglas-larocca/vimium,elderbas/vimium,bkudria/vimium,PickRelated/vimium,willsALMANJ/vimium,PickRelated/vimium,crazypenguincode/vimium,Robinson10240/vimium,smblott-github/vimium,elderbas/vimium,philc/vimium,csmalin/vimium,cyrixhero/vimium,Robinson10240/vimium,VPashkov/vimium,cyrixhero/vimium,smblott-github/vimium,poacher2k/vimium,zhangmin510/vimium,dimatter/vimium,csmalin/vimium,wildeyes/vimium,Aleroniponi/vimium,smblott-github/vimium-smblott,dimatter/vimium,llimllib/vimium,douglas-larocca/vimium,hhsue/vimium,shaung/vimium,dimatter/vimium,Robinson10240/vimium,decaffeinate-examples/vimium,Aleroniponi/vimium,wildeyes/vimium,jb55/vimium-plus,borgified/vimium,csmalin/vimium,gdh1995/vimium,hhsue/vimium,elegantwww/vimium,gdh1995/vimium,PrestanceDesign/vimium,Aleroniponi/vimium