Qubes: Install Metamask in the Brave Browser
Netamask is a great hot wallet, it is not designed to store funds long term. For interacting with Web3 applications that require signing transactions or interactions on the internet. When installing Mask the plugin advises it can technically see everything you are viewing. Having this compartmentalized is probably a good thing.
Here is a guide for installing Metamask isolated inside a brave browser AppVM. This prevents it from potentially viewing any other data on the device, or browsers in other AppVMs, security i ncompartmentalization works both ways as it also secures Metamask from being accessed by other programs


Metamask Install
To install Metamask, open up the Brave AppVM, which can be created using this guide once Brave loads then from the Chromium webstore install the Metamask extension. Then either creating or restoring a crypto wallet and keeping the recovery phrase safe. Once installed, Metamask can be found in the top right corner of the browser window and clicking on the extension jigsaw peice

This guide includes the use of the brave web browser which is a modern and Web3 pioneer of modern web browsers. It is built on Chromium, supports IPFS by default and has its own crypto wallet built into the browser. It allows users to receive crypto tokens for seeing advertising, with the feature being opt in and in doing so values peoples attention spans enough to reward the with BAT tokens.
Qubes: Two Step Guide for Installing Metamask in Brave
Here is the step by step guide for installing Metamask in Brave on the Qubes operating system

Next, the Brave Browser is not included in the base sources list and Debian requires a GPG key downloaded to verify all downloads from the Brave repo, by default the Template won’t allow the curl command access to the internet
This is a good example of how security brings inconvenience (wait to see how to copy and paste) through additional steps to a standard install before it works promoting the ideal of security through compartmentalization
1//
Open up the extension page by click on the menu in the top right and selecting Extensions from the drop down, install Metamask via the Chromium store

2//
When Metamask loads then decide create a new wallet and recovery phrase or use an existing recovery phrase

When using a wallet it is important to know that every wallets transaction history is stored on blockchains and its immutable non-changing record keeping system. The signing key for the wallet helps access previously unlocked content and login in to Web3 application

Qubes: How to Copy and Paste
How to copy and paste in QubesOS, including how to paste into the terminal using shift-ctrl-c and shift-ctrl-v used to paste between Qubes

QubesOS: Install Inkscape in Debian
How to install Inkscape inside Debian running in QubesOS and how to install fonts when using a Debian based system

Qubes: Install Nix Package Manager
Install Nix package manager Package managers in Linux provide secure ways to install applications, this guide will show you how to install the Nix package manager on a Debian based