Okay, now the contributed for Linux 64-bit is installed and it works. The flash is now no problem.
I can launch Seamonkey from the terminal:
~/seamonkey/seamonkey $ ./seamonkey
But how do I create a shorcut and a seamonkey icon on the desktop???
From where it can be launched.
edit: The commando in the launcher was simply: seamonkey/seamonkey/./seamonkey
But still to come - The Seamoney Icon...
Edit: Somehow I managed to get the Icon in place
Don't ask me how.
The only issue is now: The SeaMonkey is not in Norwegian, but that's no problem.
And I wish I could install the vivaldi fox which can be installed in Firefox...