TSGL: Firefox Tabs

[Mike Ferrell]

Something has happened with my Firefox tabs.  Instead of showing all tabs open in the tab bar it shows only the last one.  If I close it the preceeding tab that was opened is shown as "unknown".  I can click to close that and nothing happens.  And sometimes if I have several tabs open (yet only the last one shows as per my statement above), if I close it then all tabs are closed without the warning.  I have FF set up to warn me if I'm closing more than one tab.  Something strange going on.  Any ideas?
Mike F.