I recently encountered an issue with the Bootstrap IMG-RESPONSIVE class not functioning properly in the navigation bar on Firefox and IE. Oddly enough, it was working perfectly just a few days ago until I made some unknown changes, causing it to only work on Google Chrome now.
For reference, here is the link to the page where the issue is occurring:
Apologies for not providing the code directly in this message. I understand the purpose of this site now and assure you that I will not make the same mistake again. Thank you!