Just got started with Zimbra Desktop on Linux, and it's working perfectly. When reading an email, if I click on a hyperlink, a new Zimbra window opens with the appropriate content, but no navigation tools. No Back, no page refresh, no Open in new tab ...

Is the window meant to provide these tools and I just don't know how to enable them? Or do I need to fix some setting to cause clicking on a hyperlink to open a new tab in Firefox?

Thanks for any help.