Different browsers work in different ways and from memory some will start to display a page before everything has downloaded whereas others will wait until everything is ready
Your connection is not secure
The owner of camlingroup.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
Uh, a 3.45 MB download for a single page is probably your biggest problem. You have severe page bloat. Time to go back to the drawing board. You only have 4 KB of actual content on the page.