Enabling Chromium Embedded Framework in Garry's Mod. Important! Close Garry's Mod before following the instructions below. It will not work if Garry's Mod is running. 1. In your Steam games list, right click on Garry's Mod and go to properties. 2. Go to the Betas tab and click the drop down list, selecting [chromium -] to enable the Chromium branch of Garry's Mod. You can keep the code textbox empty. 3. Go to the link here: https://get.adobe.com/flashplayer/otherversions/ 4. From that link, download the PPAPI version (for Opera and Chromium) of Flash for your operating system. Untick any boxes related to optional offers that you may see. 5. Now start Garry's Mod and you should be ready to go! This will fix numerous issues regarding video playback and enable other web features that are unsupported in other builds of Garry's Mod.