Hi Robert 

Thanks for posting in the community!

We've seen similar reports in the last weeks and it seems like the issue is specific to Firefox. To fix it could you please try starting the browser in Safe Mode? If that doesn't work you could also try the 'Refresh Firefox' option to remove any preference customizations (this will reset your browser and remove your current configuration and site data).

Hope this helps! 

I don't know why but now it's working again Thanks :)

Happy to hear let us know if you have any more questions!