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
The existing feature DEBUG_STEP will help understand that the test is stuck on line 49 DEBUG_STEP=true ./mach mochitest browser_target_command_detach.js On `[STEP] browser_target_command_detach.js @ 49:3 :: ↦ await secondTargetCommand.startListening();` And the new DEBUG_TRACE_LINE feature will help understand where the code is stuck, deeply nested into async code of DevTools. DEBUG_TRACE_LINE=49 ./mach mochitest browser_target_command_detach.js On `[STEP] target-command.js @ 512:7 :: ↦ await this._onFirstTarget;` Differential Revision: https://phabricator.services.mozilla.com/D203771