I have about 10 different files going by the name js3250.dll, but they all say version 4.0 in file properties (but a few of them don't have a version tab in file properties). File dates range from 2/19/2008 to 7/19/2012. File size ranges from 443 kb to 1016 kb. They are associated with FF 22.214.171.124x, Navigator 9.0, and a couple different versions of Palemoon.
Are they interchangeable? Is there a "best" version (in terms of stability, performance) to be running on a win-98 system for FF 126.96.36.199x ?