Since installing the latest version of Flash Player I've had nothing but constant freezes?

Three weeks ago I ungraded Flash Player and ever since have had constant problems involving freezes -and sudden unexpected transitions from the internet page I'm on to my email page- with a pop-up window telling me either Flash Player is busy or not performing usually the only remedy I've been left with is to reboot or Restart.  Oddly often where I have disabled Flash Player i've later discovered it enabled again yet I am the only person with access to my computer.  Frankly I want nothing more than to be rid of Flash Player replacing it with something to perform the same function while enabling me to continue to use Firefox as my browser.  Ideas please?