A possible workaround for the Firefox browser message - A plugin is needed to display this content.

Tips to help troubleshoot the Notes Browser Plug-in

Invoke iNotes mail from the IBM Notes Browser Plug-in, and vice versa, using different scenarios

Steps for installing and configuring the Notes Browser Plug-in

Your Notes bookmarks can be synchronized and transferred to the current browser's bookmarks when using the IBM Notes Browser Plug-in