fixes 11925: cover template for firefox

BS3 commits: 8142493b42935f70881f29ed67acf991029ebdcb
Fixes 11899: Ensure proper margins and .small/small usage for heading tags (e.g., .h1-.h6)

BS3 commits: d15218a09ce68d0854d0aa5f5170c1ea859aee31
add inline note about navbar sizing

BS3 commits:0d0b5c7ddbd60808716a4cd41f3ba6aa40707cc1