Remove Firefox warning for customizer download
Remove Firefox warning for customizer download

BS3 commits: ac243cd854f9326791e622b9d44f5a43600b8ed2

up2vs/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap,ztx1491/todc-bootstrap,todc/todc-bootstrap,mozillo/todc-bootstrap,aaroncnhk/todc-bootstrap,2947721120/todc-bootstrap