I built a website offline, then put it online. It worked on Chrome, but not on Firefox.
After inspection in Firefox I found the culprit: I linked to an image with a .JPG extension (in the HTML), but the actual file had a .jpg extension. I fixed the error and everything was fine.
So far so good. But the weird thing is: when I had tested the website OFFLINE in Firefox, it worked. In other words: the case sensitivity is required online, but not offline.
Does this make sense? Is this a feature or a bug?