Thanks for letting me know. Was a specific thing in Firefox not working? I noticed double clicking to zoom was not working. I've fixed this now.
Clicking on row or column does not generate highlights and filters don't work; nothing happens! The filter box X close doesn't operate either. I'm using FF 49.0.2 and 'about:config' is out of the box. I hope this lack of response in FF isn't merely down to my setup!