Hi ,
Is there add-on which can be used in firefox 38.4 version for mp4 video play? Thanks
Regards,
Do you really mean 38.4 - a 5 year old version?
yes
Some program need the version use
38.4 was released in 11/2015
This question from 2015 suggests that it should support mp4. Maybe you need some codecs - depending on your operating system.
https://support.mozilla.org/en-US/questions/1047078