This is what's said with the latest recurrence of the 'st' thing:
You have chosen to open
[file-type icon] st
which is a: BIN file
Would you like to save this file?
I remember the http site was ads.yieldmanager.com before
I have reinstalled Mint 6 also (for a little while longer therefore I have Firefox 3.0.3), so I'm surprised it's recurred. I was wondering if it might be that my MySpace account has in some way been compromised, or these are just unethical advertisers, which of course is not something you can or should help with, unless you happen to know of this type of problem and are happy to suggest something.
I did eventually sort the 3.0.8 upgrade problem out though - though I had installed .8, if I scroll down in Synaptic .7 is still there. I wouldn't know what exactly the problem was but once I'd got rid of .7 then .8 was installed fine. Just in case someone comes looking here with the same problem.
Thanks for any further pointers....