If your Infinite Campus (in Firefox) is not displaying correctly then you may need to clear the cache.
An example of this issue is we installed a new version of IC and browser was reading the pages out of cache and thus an error may occurred or the pages just didn't display correctly.
To clear the cache:
Option 1 (shortcut):
Hold SHIFT and hit the F5 key
Option 2 (shortcut):
Hold SHIFT and click on the refresh icon next to the address bar.
Option 3 (detailed):
Follow the instructions in the solution. click here to clear cache...
Option 4 (detailed):
Follow link to Microsoft solution. click here...