I was going to post this question, but then I figured out the answer, so now I'll post the question and the answer for anyone else who searches how to do this. This is for windows but may work on other OS idk.
How To Download Netflix On Mac With Silverlight Version
Silverlight is the browser plug-in that allows you to watch TV shows and movies on your computer. Follow the steps below to install the Silverlight plug-in on your Mac computer. Open Netflix and select any title to play. When a Silverlight dialog box opens, select Install Now. Open the Downloads page and double-click on Silverlight.dmg. Firefox Download For Mac 10.12.5 Imovie Download For Mac Free Full Canon Mp530 Driver Download For Mac Safari 6.1.6 Download For Mac Malware Download For Mac Free Reddit Microsoft Silverlight Download For Mac Netflix Epson Xp-610 Printer Driver Download For Mac.
My older computer runs netflix smoothly in silverlight, but choppy in html5.
Netflix detects that I run a browser which is supposed to have html5 DRM support, so it goes straight to using the html5 player. So I disable DRM in firefox, and set Widevine to never activate. But then when I try to watch a netflix video, instead of it using silverlight, which I have, it plays nothing and tells me to Enable DRM. That's pretty much a bug with their system or firefox, or just a poor design choice imo.
How To Download Netflix On Mac With Silverlight Free
Microsoft Silverlight For Mac
To fix it and force Netflix to use Silverlight, you just have to install a User Agent switcher and pretend to be a slightly older version of firefox (for example 40). Then Netflix will think your browser doesn't have html5 drm capability and it will use silverlight.