Describe the bug:

On MacOS systems, (as mentioned in the bottom of the README) an absolute path is required to run commands when terminal mode is off.

To Reproduce:

Steps to reproduce the behavior:

1. Set the command to use a non built-in command, such as "node ${path.join(__dirname, './tester.js')} $_URL_" (See how it uses node?)
2. Set terminal to false in the configuration.
3. Register the protocol.
4. Go to the protocol in a browser.
5. It will error and say that the command does not exist.

Expected behavior:

It should run the command like a user is doing so.