Firefox, you cannot edit any pages in the backend of Sitefin

Any ideas of how I can fix this?

I found when I add a blank content block the page becomes editable, this isn't a very tidy solution though.

I would send your project to support to look at...I exclusivly use firefox since Sitefinity 4 came out and I've never seen this.

 Have you opened firebugs console to see if theres any script errors?...or disabled extensions?