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juliandescottes/toolbox_server_error_telemetry_summary_02_03_2026.md

Created March 2, 2026 10:37
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toolbox_server_error_telemetry_summary_02_03_2026.md

Summary

Total Events: 44 toolbox crash events (Feb 23 - Mar 1, 2026)

Key Findings

  1. Most Common Error: TypeError in _getDebugTargetData (13 occurrences - 30%)
  • Location: toolbox.js:1486 → isDebugTargetFenix → _getPickerAdditionalClassName
  • Trigger: During toolbox initialization (open → _buildButtons → _buildPickerButton)
  • Distribution: Primarily on Windows/aurora, but also nightly and beta
  • Impact: Affects the picker button initialization
  1. Out of Memory Errors (8 occurrences - 18%)
  • Packet Type: watchTargets (7) and watchResources (1)
  • Location: Client-side in Front.js:404 during RDP requests
  • Pattern: Occurs during toolbox opening when establishing target watchers
  • OS: Evenly distributed across Windows, Darwin, Linux
  1. SecurityError (8 occurrences - 18%)
  • Location: document-events.js:66 in the listen function
  • Packet Type: All are watchResources
  • Root Cause: Document event listener setup failing with security restrictions
  • Pattern: Happens during resource watching initialization
  1. async-storage Errors (6 occurrences - 14%)
  • Location: async-storage.js:100 in getItemOnError
  • Pattern: All from same Darwin/aurora user (possibly single session)
  • Timing: Clustered on Feb 26 between 13:23-13:34
  1. Other Errors:
  • AbortError (2): watchTargets aborted
  • InvalidStateError (2): Window global target actor in invalid state
  • TypeError in watchTargets (1): Server-side watcher error
  • Generic undefined errors (3): Various locations

Platform Distribution

  • Windows: 23 (52%)
  • Darwin/macOS: 15 (34%)
  • Linux: 6 (14%)

Channel Distribution

  • aurora: 31 (70%)
  • nightly: 9 (20%)
  • beta: 4 (9%)

Critical Issues to Address

  1. High Priority: Fix TypeError in _getDebugTargetData@toolbox.js:1486 - this is the single most common crash
  2. High Priority: Investigate out of memory errors during target watching
  3. Medium Priority: Handle SecurityError in document-events listener gracefully
  4. Low Priority: Investigate async-storage failures (may be environment-specific)

Recommendations

  1. Add null/undefined checks in toolbox.js:1486:17 before calling isDebugTargetFenix
  2. Implement memory limits or pagination for watchTargets to prevent OOM
  3. Add try-catch with fallback for SecurityError in document event listening
  4. Review async-storage error handling in async-storage.js:100
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