Hello chinatrain -
I am sorry to hear that you have run into difficulty with the description editor while using Firefox, as you can see we have this other report of a similar difficulty, however, we have not yet been able to reproduce this issue on our end.
Please file a support case from under the Help tab of the site letting us know the details of what you experience and please be sure to include your operating system information as well as the version of your browser in the support case. Please also let us know if you have any extensions, toolbars or add on's to your browser - especially if those have been recently added or updated so we can look into this further.
Please note that in the few other reports we have received this issue appears to be specific to Firefox, so you should be able to use the lister as usual if you use an alternate browser, such as Google Chrome.