A new feature in the more updated version of the browser that is causing some difficulty is that there is a Close button for each tab. I much preferred having the one Close button to the right of the Window that could be used for any tab. Clicking the Close button closed the current tab.
I know this is old news for a lot of people, as I have found mild consternation to howls about the new ‘feature’, as well some hacks to modify the functionality. However, I’m getting used to the new way of doing Tabbed Browsing so I’ll let it be for now.
 Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.10) Gecko/20061113 Firefox/1.0.4 (Debian package 1.0.4-2sarge13)
 Mozilla/5.0 (X11; U; Linux i686; en-US; rv:220.127.116.11) Gecko/20070310 Iceweasel/18.104.22.168 (Debian-22.214.171.124-1)