Oh, so it was not in the preferences gui before the 2.19.x series? That may explain why I never tried it actually :)Yes, at long last it's been added as a preference -- the functionality has been available since the dawn of time :-) (If you're not using the latest development release and want to have smooth scroll, go to about:config and set "general.smoothScroll" to the boolean value "true". Create the key if necessary.)
Strange, I have LCD screens and experience no such problem... Oh well :)It's because smooth scrolling is reported to cause eye strain to some users with LCD screens. Also the performance over remote X connections is bad. See [1]. But most people should be just fine.