The latest Firefox v56 update on Mac OS X is not working with MySpeed or may crash when MySpeed is loaded.

There is an update for MySpeed to work with Firefox v56+

Download and install MySpeed 6.4 (6438).

For more information about the changes to Firefox and why this updated is needed, read more at the link below.

Click here for the full details of why this update is needed..

Applies to: MySpeed for Mac Version 6.3+ and Firefox v55+

Operating System: OS X