Only create new Boxy instance if there's none on the page already
Only create new Boxy instance if there's none on the page already


Former-commit-id: ca22eacef26c884a8f021392c6086532d0f3874d
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine