Have you tried using the Exception option for allowing site cookies?
Here's what you need to do.
Go to the website you wish to always stay logged into and copy the address (highlight + ctrl+c)
Now go up to the menu and open Tool/Options/Privacy/Cookies/Exceptions
Now paste (ctrl+v) the website address you just copied into the "Address of Website box"
Right below the "Address of Website box", click on the Allow button then close the Exceptions window, then close the Options window by clicking on OK.
This procedure tells FF to allow and save cookie information for the site you just provided.
You will have to do this for every site you wish to work this way.
Note also that if you have just opened your browser and visit another area of this site that has a different address that you have "not" entered into the Exception box, you will have to log in. In other words, this procedure is strict and address sensitive!
You must also set FF options not to delete cookies at shutdown and also not until they expire.
Last note... this will not work for every single site... but it sure works for this one!
Edited by makai, 10 December 2005 - 01:21 AM.