Bump supported version of FF to 3
Bump supported version of FF to 3

2 doesn't have getBoundingClientRect, which we use extensively.

Closes #1062

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endor/CodeMirror,r7kamura/CodeMirror,MarcelGerber/CodeMirror,NumbersInternational/CodeMirror,bocharsky-bw/CodeMirror,ficristo/CodeMirror,ZombieHippie/CodeMirror,sekcheong/CodeMirror,jkaplon/CodeMirror,EasonYi/CodeMirror,isdampe/CodeMirror,jansel/CodeMirror,r7kamura/CodeMirror,jpolitz/CodeMirror,antimatter15/CodeMirror,hackmdio/CodeMirror,jochenberger/CodeMirror,mightyguava/CodeMirror,camellhf/CodeMirror,vanloswang/CodeMirror,michaelerobertsjr/CodeMirror,isdampe/CodeMirror,increpare/CodeMirror,Aliccer/CodeMirror,increpare/CodeMirror,xeronith/CodeMirror,jhnesk/CodeMirror,bluesh55/CodeMirror,Carreau/CodeMirror,Allenice/CodeMirror,happibum/CodeMirror-main,cintiamh/CodeMirror,bfrohs/CodeMirror,cben/CodeMirror,sanyaade-iot/CodeMirror,joshterrell805-historic/CodeMirror,jessegrosjean/CodeMirror,vincentwoo/CodeMirror,davidpham87/CodeMirror,ficristo/CodeMirror,cintiamh/CodeMirror,manderson23/CodeMirror,abdelouahabb/CodeMirror,axter/CodeMirror,jkaplon/CodeMirror,supriyantomaftuh/CodeMirror,isdampe/CodeMirror,philuchansky/CodeMirror,gkoberger/CodeMirror,Icenium/CodeMirror,ejgallego/CodeMirror,crazy4chrissi/CodeMirror,nightwing/CodeMirror,sanyaade-iot/CodeMirror,hccampos/CodeMirror,Ermlab/CodeMirror,ejgallego/CodeMirror,manderson23/CodeMirror,trumanliu/CodeMirror,kuangyeheng/CodeMirror,explorigin/CodeMirror,ksanaforge/CodeMirror,abdelouahabb/CodeMirror,nawroth/CodeMirror,mtaran-google/CodeMirror,systay/CodeMirror,matthewbauer/CodeMirror,fmoliveira/CodeMirror,matthewbauer/CodeMirror,kevinushey/CodeMirror,hackmdio/CodeMirror,loopspace/CodeMirror,sgoo/CodeMirror,webida/CodeMirror,melpon/CodeMirror,ksanaforge/CodeMirror,dbarnett/CodeMirror,alur/CodeMirror,karevn/CodeMirror,pinbe/CodeMirror,fivetran/CodeMirror,thomasjm/CodeMirror,qiankun007/CodeMirror,Dominator008/CodeMirror,grzegorzmazur/CodeMirror,elisee/CodeMirror,skylarkcob/CodeMirror,matthewbauer/CodeMirror,notepadqq/CodeMirror,buchslava/CodeMirror,agendor/CodeMirror,djadmin/CodeMirror,happibum/CodeMirror-main,trumanliu/CodeMirror,rustemferreira/CodeMirror,pjkui/CodeMirror,increpare/CodeMirror,morrisonwudi/CodeMirror,INTELOGIE/CodeMirror,kangkot/CodeMirror,ZombieHippie/CodeMirror,dudb/CodeMirror,Jisuanke/CodeMirror,rrandom/CodeMirror,TechnicalPursuit/CodeMirror,NumbersInternational/CodeMirror,mihailik/CodeMirror,mizchi/CodeMirror,davidpham87/CodeMirror,jayaprabhakar/CodeMirror,AlanWasTaken/codemirror,sourcelair/CodeMirror,Aliccer/CodeMirror,anthonygego/CodeMirror,mizchi/CodeMirror,elisee/CodeMirror,sekcheong/CodeMirror,pabloferz/CodeMirror,flyskyko/CodeMirror,codio/CodeMirror,pabloferz/CodeMirror,symbla/CodeMirror,ssxxue/CodeMirror,rrandom/CodeMirror,codio/CodeMirror,jessegrosjean/CodeMirror,wbinnssmith/CodeMirror,kolya-ay/CodeMirror,buchslava/CodeMirror,Dominator008/CodeMirror