How to install addons's or arkenfox profile in template vm so it is there in disposable vm?

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[Guide] Automatically install extensions and configure new (dispvm) hardened Firefox profiles with arkenfox user.js and policies

This was inspired by a number of posts that sometimes pop up on the forum. Section 1 explains how to use arkenfox’s (but you can use any other) user.js file (GitHub - arkenfox/user.js: Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening) and make it compatible with Firefox autoconfig, in order to automatically configure new dispvm (or appvm) profiles without first creating one (so no profile-name fingerprinting). For more information, s…