Ubuntu – How to uninstall and remove Firefox in Ubuntu 18.04

One option would be to go to the folder you installed it from (where the Makefile resides - pretty much where you unzipped it to in the first place, and where you navigated for the initial make install command) and typing sudo make uninstall. Generally speaking this will remove the files that were copied to various places during the installation process (if it's appearing in your Dash then it's unlikely to have only put files into the home folder)

The reason the apt-get commands aren't working for you is that you installed from a zip file - apt-get only controls packages downloaded from the repositories, so you can only apt-get remove or apt-get purge packages you apt-get installed in the first place.

After looking around, i managed to solve my problem. If you can build packages without building from source, do it. If not, when building your package from source, you will eventually run into having to run

make install

Instead of that, run

check install

to create a .deb package which can be easily removed with your package manager software when you want to uninstall. Doing so removes all the related files and data