Grrr ...... Firefox™

Before closing Firefox™

~/tmp$ free
             total       used       free     shared    buffers     cached
Mem:        775880     768184       7696          0       5660     330800
-/+ buffers/cache:     431724     344156
Swap:       979924      38612     941312
~/tmp$ ps uax | grep firefox
u1   13606  2.7 22.7 472800 176276 ?     Sl   Oct21  80:17 /usr/lib/firefox/firefox-bin
u1   18930  0.0  0.0   1644   524 pts/7  R+   16:22   0:00 grep firefox

After closing Firefox™

~/tmp$ free
             total       used       free     shared    buffers     cached
Mem:        775880     582932     192948          0       5900     329048
-/+ buffers/cache:     247984     527896
Swap:       979924      38612     941312

Wow! Closing Firefox released about 210MB of RAM! Ksysguard was showing a memory usage of about 450MB for the firefox-bin process! That explains why it acts like a drunk homeless guy if you run it for more than a day.