That's not the issue here. VSCode and FireFox are false equivalents. Even if you'd rebrand the fork, Signal forbids non-official clients/builds from connecting to their servers. Enforcement has been selective but the last official word AFAIK is that you are not allowed to fork, rebrand, and distribute a client which alllows you to chat with Signal users.
Mozilla still allows you to install and download add-ons and use other Mozilla services like VPN and Relay from your LibreWolf build.
Two wrote a two-part complaint, one part about clients, and the other part about Signal going after people using the Signal name. My comment was only about that second part (hence why it starts the way it starts).
Mozilla still allows you to install and download add-ons and use other Mozilla services like VPN and Relay from your LibreWolf build.