Hah, funnily enough, the profiler is the primary use case in the description of bug 797639, which added the bulk writing capabilities 9 years ago. "Performance profiling" is also mentioned in [a section about bulk data in the Debugger Protocol documentation](https://firefox-source-docs.mozilla.org/devtools/backend/protocol.html#constant-overhead-bulk-data).
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Hah, funnily enough, the profiler is the primary use case in the description of bug 797639, which added the bulk writing capabilities 9 years ago. "Performance profiling" is also mentioned in [a section about bulk data in the Remote Debugging Protocol documentation](https://firefox-source-docs.mozilla.org/devtools/backend/protocol.html#constant-overhead-bulk-data).