The edraw office viewer component supports the IE6/7/8/9 now.

If FireFox installed the activex control support addon, it’s ok.

Firefox.

Instructions
1
Determine what version of Firefox you are using by clicking on “Help” from the Firefox menu bar. Click “About Firefox” to see the version number listed underneath the Firefox logo.
2
Visit the Firefox Mozilla website to locate the Esker Active X Plug-In (see Resources).
3
Read to see which version of the plug-in is compatible with the version of Firefox you are running. If there is more than one version of Active X for your Firefox version, always download the latest Active X version since it will reflect updates.
4
Ensure that the box is checked to install the “Experimental Add-On.” Click “Add to Firefox.”
5
Accept the license agreement by clicking on the “Accept and Install” button. Once the automatic installation completes, Active X will be activated automatically for Firefox. If for some reason it does not auto-activate, click on “Tools” and “Add-Ons” from the Firefox menu. Click the “Plug-Ins” tab and click “Enable.”
If you have any question, please feel free to contact us.
You can go to the Esker website:
http://www.esker.com/fm/others/DL_ActiveX/
Then click the “I ACCEPT, Proceed to file downloads ” link at the botton of the page.