Use only ' and ` for jumping to previous position.
Use only ' and ` for jumping to previous position.

As suggested by @mrmr1993 in #1716.

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