Firefox - lost back pointer

[Timothy Murphy <tim birdsnest maths tcd ie>]

I seem to have lost the pointer one can click
to go back to the previous web-page.
It doesn't matter that much
since I can attain the same end by Alt-Left Arrow .
It is quite possible I inadvertently made some change
in my Firefox settings,
but I see nothing relevant in Edit=>Preferences.

Any suggestions gratefully received.


-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland