Canvas on edit mode doesn't show design objects on Firefox for Mac
Hello.
I've been having problems with Express on Firefox for Mac for a while. A few months back (when it was still Spark Post) I could make and edit projects using the web interface but since the update I haven't.
1. When opening a project it shows a blurry preview, but then it turns white and disappears.

2. While the canvas looks white/empty you can still interact with the elements you placed, yet the design and changes still doesn't show.

What would it be? I've encountered this problem on both regular and incognito mode, even without addons. Using Chrome for Mac works properly.
Thanks in advance.
