Allow flash content to run by default in Chromium by using a management policy file

AllowFlashInChromium.md

Tested on Ubuntu 14.04 and Chromium 65

Steps

apt-get install chromium-browser adobe-flashplugin

mkdir -p /etc/chromium/policies/managed

vim /etc/chromium/policies/managed/foo_policy.json

Add the following content to foo_policy.json

{
  "RunAllFlashInAllowMode": true,
  "AllowOutdatedPlugins": true,
  "DefaultPluginsSetting": 1,
  "PluginsAllowedForUrls": ["https://*", "http://*"]
}

Verify that Chromium picked up the policies by navigating to chrome://policy.

Test flash auto play with e.g. http://ultrasounds.com

For Google Chrome instead of Chromium

mkdir -p /etc/opt/chrome/policies/managed
vim /etc/opt/chrome/policies/managed/foo_policy.json