Items relating to knoppix 7.2

After updating my 7.0.5 usb to 7.2 and launching previously installed firefox, I get the message:
Adblock Plus 2.2.4 install request. I declined, but wonder about this request and what caused it to happen?

Same with FoxyProxy - declined

Went to - issues with the flash player - had intermittent issues in the past with knoppix and firefox (same issue when launch iceweasel)