Please can you being able to help me with this ?

Hi there, I need your help finding the offmp4 video downloader extension for Firefox i had it as of yesterday morning but i reinstall my Windows and now its gone from my extensions saved on my account. And i can’t seem to been able to find it by searching on the Firefox extensions page. Please can you being able to help me with this ? Thank you for your help and support ! Best Regards A.Nieche