Can this be accessed by us? We cannot help without any information like steps to replicate, screenshots of error messages...

Not really. I cannot give you administrator rights to my e-commerce websites. There are no error messages, Firefox simple fails to display any information. I have found this is also try when trying to process customer orders on the GoDaddy hosted sites via Firefox. I can process orders when logged in via Chrome. I would be happy to try to trouble shoot while on a live call with Mozilla support. Otherwise there is no data I can provide as there are no error messages. Again, this is a new issue as I have been using Firefox for many years without issue.