I installed Firefox Dev on Ubuntu 18.04 per these instructions (marked as correct answer):
Error while installing Firefox Developer Edition on 18.04.1 LTS
When I search for Firefox Dev, Ubuntu only turns up the Firefox browser.
And in Terminal when I type firefox-dev --version I get "No such command".
which firefox-devin a terminal? That should list the path to the application if it is installed. You might also trylocate -b firefox-dev. The packagefirefox-devis available in Ubuntu repositories, so this method of installation you linked above may not be the best method:sudo apt updatefollowed bysudo apt install firefox-devshould be all you have to do. – Nmath Jun 12 '19 at 22:18