Recently a new feature was added to firefox, i got a message box asking for something, "a lazy person's response to the confirmation box was "yes". Figured out later that it has started to show a blinking cursor everytime i clicked anywhere on the browser i.e. firefox 3

Resolution:

Option 1 (easy shortcut):
Press F7 (toggles this feature on-off)

Option 2:
Go to this option: Tools > Options > Advanced > General
Uncheck the first checkbox: "Always use the cursor keys to navigate within pages"

Was simple, but took some finding, why was this option added in the first place, if anyone knows, do add information here for others to benefit.