Firefox on an Apple Imac

I just got my first Apple Imac after many years of using Windows
machines under various flavors of Windows and running Firefox in all
of them.
I downloaded Firefox for the Mac but when it runs there is no menu bar
up the top of the screen so I can't set it up the way I wan, for
example I can't set it to save tabs of closing down, can't change to
download folder etc.
I searched the Firefox web based help files and there are several
posts that say holding down the alt key (I think that's the key, but
my memory is not perfect) but even following all the suggested cures
nothing worked. Does anyone know how to fix the problem?
Firefox works okay apart from that problem.

Thanks in advance.

 

See http://mzl.la/Mp9V9v
______________________________________________________________
Note: this link will detect your version of Firefox and show
information for that version. If the page does not show the
information for your Mac Firefox, then go to the bottom of the
right-hand column, click the '+' to expand the options, and
select Mac and your version of Firefox.

 

Thanks Ralph. It was there all the time but because I am new to Apple
and am on a steep learning curve, I thought it was Apple commands
across the top of the screen not part of Firefox and having the
options hidden under the Firefox tag instead of Tools didn't help in
finding the Options setting boxes.
However I set it to keep my tabs when shutting down but it still warns
me I am shutting down multi tabs and shuts them all down. why is that
and how can I fix it so it saves the tabs?

Thanks in advance again.

 

To turn off the warning when closing multiple tabs

Firefox >> Preferences >> Tabs
turn off "Warn me when closing multiple tabs"


To automatically show the tabs from last time when Firefox starts

Firefox >> Preferences >> General
For 'When Firefox starts', choose "Show my tabs and windows from last time"