I'm not aware of a way to trigger Firefox to

Load Temporary Add-on

every time automatically when you start Firefox normally.

This article mentions a command-line tool; I haven't tried it myself:

https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/Temporary_Installation_in_Firefox#Using_the_command_line

To make it more convenient -- to distribute it on their website in an installable format -- the extension author needs to get the add-on signed.

Can Mozilla just add dissenter back to their app store. It promote free speech on the web and they even block out derogatory terms.

I thought Mozilla supported the free and open internet?

The add-ons team has a forum on another site, and there is a thread about Dissenter here:

https://discourse.mozilla.org/t/the-removal-of-the-dissenter-extention/38140