Best way for a "startup command" script?

– OH! I SEE I DID PLACE THIS MSG IN THE WRONG FORUM DIVISION: –
– I use Netrunner rolling based on Arch! Excuse me pls! –

I like to actualize my ~/.mozilla exactly as I want at the begin of each new session and immediately open the browser (note: I use Seamonkey as I use really intensively the WYSYG HTML editor, the only one in the Linux world, as blue griffon was a flop), but I would be interesting to use the same upgrades as Firefox did become now in Netrunner rolling!). For this reason I have a frozen .mozilla named ~/…mozilla, the startup script erases the used one and makes a copy. as it is ready, it starts Seamonkey. Not more…

If I want change …mozilla, I start a new session where Seamonkey gets my “ideal” stand, make the changes, and only that, erase my histories, quit Seamonkey, erase ~/…mozilla manually and rename ~/.mozilla into ~/…mozilla, and copy it as ~/.mozilla to restart the browser and work with the new stand… This is more flexible as the “erase private data” from Mozilla as you can for example preserve some user names and passwords and don’t save other one outside the session!

What is the best way?

Actually I’m not quite sure what you want to achieve really. But there is a “Startup and Shutdown” section in System Settings, where you can add scripts etc.