Ok, try this...
Every since the last flash updates, Firefox
is notorious for crashes when playing flash games. Vista is fine,
but the browser is not very compatible. Try switching over to Maxthon (very similar to firefox) or try SRWare Iron (similar to google chrome).
Once you try one of these, dedicate it only to
playing the game. Keep your other browser for personal use. Either
way, you need to right click on the game screen and select (settings).
Once there, click on the file location on the bottom. Drag the
slide bar to the (unlimited) placement. You can check to see how much
flash memory you have used in this place also. If it ever gets over 25kb
you will need to right click on the game page, select (global settings) and
delete data / go to advanced tab / delete data there to.
Side note, I have installed a program called (advanced system care 6). I
run this once a week to optimize my system. If you choose to try this, it
is free and helps a ton (on and off the game performance). You can also
select the expert mode and turn on internet booster to prioritize you browser
in the task menu which makes the game buttery smooth.
this was passed on to me and worked fantastically, hope it goes fine for you to !
Cheers Trayback