Limitation: This FAQ applies to version 3.0 or higher.
In order to watch Netflix and some YouTube videos, you must have H.264 codec support.
On computers with Intel, AMD or other x86-64 CPUs: from Endless OS 3.0.7 onwards, you can install Google Chrome from the App Center. Netflix and YouTube should work fully in Google Chrome. Depending on when you first installed Endless OS, it may already be your default browser.
On the Endless Mini or other computers with ARM CPUs: YouTube should work fully in the built-in browser but Netflix is not supported due to digital rights management.