Nit: I usually use "make arguments" instead of environment variables to set make variables, i.e.:

    $ make LIBADB_LOCATION=local

And below, for running:

    $ make run BIN=<PATH TO FIREFOX BINARY>

The effect is the same, but it's a bit easier to pick out the command being invoked ("make", "make run") when it's the first thing in the command line.