Emy, i don't have flashgot .... though i have read about that extension.
But about you getting download offer after an *abort connection* message, I wish someone would be able to answer.
That does not need any browser extension or any such thing.
Must be something in your computer.
You did have some security apps more than me
EDIT
If this was some common problem all are suffering. Webshield finding some and you still get asked. I am SURE it would have been posted hre many times.
So emy, something is sure wrong with your antivirus setup.
Even I poor soul running Sygate firewall with it having a quite negative impact on outbound control with avast webshield proxy have always found Avast working fine for me