Originally Posted by NomakeWan
As mentioned before, disabling all plugins did not resolve the microstutter issue in Waterfox 18.0.1. Uninstalling and reinstalling from scratch did at least give me an excuse to hunt down a plugin that was annoying me and bother to uninstall Silverlight, though, so it wasn't all for nought!
If you haven't tried this yet try and see if it helps your stuttering problems,I'm not getting them but ff users have reported this has worked for them;
Try this for stuttering flash video:
Right-Click on the volume icon in the sys tray.
Click on Playback devices
Select the device which you are currently using (default)
Click the properties button
Go to the Enhancements tab
Check "Disable all Enhancements"
Ok and Apply.
This trick worked for many.
Reboot and try your browser again.