How can I get the edit mode with tinymce only?

Hi all
I have created one site using drupal. My client wants to modify the content ( content only ) . When I took the node in edit mode ( like mysite/node/edit) I got all the editing properties in IE. but not in Firefox. I want to get only the tinymce editor in edit mode , because my client need only modify the content.
How can I get the edit mode with tinymce only?
What happend when I took the node in Firefox?
There is any possibilty to fix a button to get edit mode? instead type linkenode/edit?
How can I remove the 'Recent Comments' from my page?

you can check this :http://missionnetwork.comeleonwebtest.info/node/21/edit

Anybody can help me...

Thanks in advance

Jurdi