Simply enter your website address to generate the code snippet. Then strategically copy/paste the code snippet inside any other js file used on your website.
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The script creates no global variables and runs on execution. It's small and runs extremely fast. While it hasn't been tested with all frameworks, it's unlikely to experience compatibility issues as it has no dependencies and doesn't pollute the global namespace.
Typically one important .js file should be enough, but the snippet can be added to more than one file if necessary.
With a more sophisticated trace, yes. But the errors generated by DomainLockJS are not generated within the code snippet itself. So tracing the error isn't straightforward. Errors are generated inside other, existing page functions.