IIRC, some slightly different code was needed for Firefox 65, I believe I left that code in disable-add-on-signing.js when I modified it for Firefox 66, but I'm not sure about that. We're going to use a technique which allows you to run arbitrary JavaScript code in the browser context from files stored in your Firefox profile directory.

May 30, 2018 SSH from the browser | Compute Engine Documentation Jul 09, 2020 firefox – /dev/blog Jul 04, 2015

For example, you’ll need to do this if you create an SSH tunnel using dynamic port forwarding and want to send your browsing traffic through it. Firefox will send your browsing activity through the proxy server running on your local computer. By default, Firefox uses SOCKS v5 for the connection.

Q: SSH authenticates using Kerberos tickets, but Mosh asks me for a password. In some configurations, SSH canonicalizes the hostname before passing it to the Kerberos GSSAPI plugin. This breaks for Mosh, because the initial forward DNS lookup is done by the Mosh wrapper script. To work around this, invoke Mosh as

how to ssh in firetv | TV ADDONS

How to check and update Firefox plugins | Tech Help KB Oct 19, 2017 How to Configure a Proxy Server in Firefox