Posted on Dec 14, 2013 1:15 AM, Apple Support Communities - OS X Mavericks | discussions.apple.com
I just unboxed my brand-new 27" iMac and have been merrily computing for a day and a half. Suddenly the magic mouse stops scrolling in Firefox. I Google the issue and find that broken scrolling is often associated with the Mavericks upgrade, albeit most commonly with Chrome.
My experience: in Firefox, scrolling quits working within a few moments of opening the app. Restarting Firefox fixes it only temporarily. Oddly, I have noticed that when attempting to scroll up and down on a blank Firefox window, scrollable open windows behind the Firefox window (App Store or iTunes, for example) will begin to scroll. Another bizarre feature of the glitch seems to be that functionality will spontaneously return for no apparent reason, only to break again soon thereafter.
Because this loss of functionality has put a serious hitch in my gitalong, I have been investigating many threads on many fora detailing fixes and workarounds. These include re-installing Mavericks and resetting PRAM and so forth, but since I'm working off a spanking-new factory-fresh install on a pristine machine, I am reluctant to go to such lengths, particularly since success has not been uniformly reported with these measures.
Other suggestions that have not been fruitful: disabling 2-finger swipe in mouse prefs and restarting the iMac. Selecting "Always show scroll bars" in System Preferences is touted as a workaround, and it does enable scrolling after a fashion, but in my view is not sufficiently convenient to replace scrolling from the mouse itself.
All other apps seem unaffected at this point, but I note that these are early days.
I was wondering if anybody has been able to determine the origin of this bug, whether it is a function of Mavericks, Firefox, the Magic Mouse, or the unholy spawn of all three working together, and also if there is any real solution. Thanks, yall!