If the question to me, I'll try to answer in more detail
1. When using a default working profile
a) with enabled flash plugin: firefox remains in memory after closing
b) with disabled flash plugin: firefox remains in memory after closing
c) and flash plugin was removed (apt-get remove flashplugin-nonfree): firefox remains in memory after closing
2. When using a new "clean" profile without any user addons
a) with enabled or disabled flash plugin: firefox remains in memory after closing
PS: In Kubuntu 8.10 / KDE 4.2.2 the same version of Mozilla Firefox (3.0.9 Gran Paradiso) is working OK.
If the question to me, I'll try to answer in more detail
1. When using a default working profile nonfree) : firefox remains in memory after closing
a) with enabled flash plugin: firefox remains in memory after closing
b) with disabled flash plugin: firefox remains in memory after closing
c) and flash plugin was removed (apt-get remove flashplugin-
2. When using a new "clean" profile without any user addons
a) with enabled or disabled flash plugin: firefox remains in memory after closing
PS: In Kubuntu 8.10 / KDE 4.2.2 the same version of Mozilla Firefox (3.0.9 Gran Paradiso) is working OK.