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Created May 25, 2026 12:06
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toolbox_component_error_telemetry_summary_25_05_2026.md

DevTools Toolbox Error Analysis - Component (React) Errors

Period: 2026-04-07 07:50 to 2026-05-24 23:33 Total Errors: 626

Overview

The analysis reveals 626 component (React) errors, with the most common error being 'TypeError' (77.0%). 95.8% occur on release. Windows users account for 75.4% of all errors.

Platform Distribution

  • Windows: 472 errors (75.4%)
  • Darwin: 78 errors (12.5%)
  • Linux: 76 errors (12.1%)

Channel Distribution

  • release: 600 errors (95.8%)
  • aurora: 18 errors (2.9%)
  • default: 4 errors (0.6%)
  • beta: 2 errors (0.3%)
  • unknown: 1 errors (0.2%)
  • nightly: 1 errors (0.2%)

Error Breakdown by Category

1. TypeError in EvaluationContextSelector - 233 errors (37.2%)

Component:

  • Primary: EvaluationContextSelector

Error location:

get name@resource://devtools/client/fronts/targets/worker.js:35:5

Affected:

  • Channels: release (233)
  • Platforms: Windows (195), Darwin (28), Linux (10)

2. TypeError in ConsoleSettings - 167 errors (26.7%)

Component:

  • Primary: ConsoleSettings

Error location:

get doc@resource://devtools/client/framework/toolbox.js:616:5

Affected:

  • Channels: release (157), aurora (8), beta (2)
  • Platforms: Windows (113), Linux (37), Darwin (17)

3. TypeError in HTMLPreview - 28 errors (4.5%)

Component:

  • Primary: HTMLPreview

Error location:

maybeCancelContentJSExecution@resource://gre/modules/RemoteWebNavigation.sys.mjs:42:5

Affected:

  • Channels: release (28)
  • Platforms: Darwin (14), Windows (14)

4. undefined in RequestListContentComponent - 20 errors (3.2%)

Component:

  • Primary: RequestListContentComponent

Affected:

  • Channels: release (20)
  • Platforms: Windows (14), Linux (5), Darwin (1)

5. InternalError in ResponsePanel - 17 errors (2.7%)

Component:

  • Primary: ResponsePanel

Error location:

parseJSON@resource://devtools/client/netmonitor/src/utils/request-utils.js:719:51

Affected:

  • Channels: release (14), aurora (3)
  • Platforms: Windows (11), Linux (4), Darwin (2)

6. undefined in JSTerm - 15 errors (2.4%)

Component:

  • Primary: JSTerm

Affected:

  • Channels: release (13), aurora (2)
  • Platforms: Windows (15)

7. TypeError in MenuButton - 14 errors (2.2%)

Component:

  • Primary: MenuButton

Error location:

UNSAFE_componentWillReceiveProps@resource://devtools/client/shared/components/menu/MenuButton.js:135:17

Affected:

  • Channels: release (14)
  • Platforms: Windows (11), Linux (2), Darwin (1)

8. undefined in Connect(MonitorPanel) - 12 errors (1.9%)

Component:

  • Primary: Connect(MonitorPanel)

Affected:

  • Channels: release (12)
  • Platforms: Windows (12)

9. undefined in RequestListColumnFile - 7 errors (1.1%)

Component:

  • Primary: RequestListColumnFile

Affected:

  • Channels: release (7)
  • Platforms: Windows (7)

10. TypeError in ToolboxToolbar - 6 errors (1.0%)

Component:

  • Primary: ToolboxToolbar

Error location:

render@resource://devtools/client/framework/components/ToolboxToolbar.js:548:32

Affected:

  • Channels: release (6)
  • Platforms: Linux (4), Darwin (1), Windows (1)

Top Error Types Summary

  1. TypeError in EvaluationContextSelector - 233 occurrences (37.2%)
  2. TypeError in ConsoleSettings - 167 occurrences (26.7%)
  3. TypeError in HTMLPreview - 28 occurrences (4.5%)
  4. undefined in RequestListContentComponent - 20 occurrences (3.2%)
  5. InternalError in ResponsePanel - 17 occurrences (2.7%)
  6. undefined in JSTerm - 15 occurrences (2.4%)
  7. TypeError in MenuButton - 14 occurrences (2.2%)
  8. undefined in Connect(MonitorPanel) - 12 occurrences (1.9%)
  9. undefined in RequestListColumnFile - 7 occurrences (1.1%)
  10. TypeError in ToolboxToolbar - 6 occurrences (1.0%)

Actionable Insights

    1. TypeError in EvaluationContextSelector accounts for 37.2% of all errors (233 occurrences)
    1. release channel dominance: 95.8% of errors are from release
    1. Platform-specific: TypeError in EvaluationContextSelector is predominantly on Windows (195/233 errors)

Recommendations

Priority 1: TypeError in EvaluationContextSelector

  • File location: devtools/client/fronts/targets/worker.js:35:5
  • Impact: 37.2% of all errors

Priority 2: TypeError in ConsoleSettings

  • File location: devtools/client/framework/toolbox.js:616:5
  • Impact: 26.7% of all errors

Priority 3: TypeError in HTMLPreview

  • File location: gre/modules/RemoteWebNavigation.sys.mjs:42:5
  • Impact: 4.5% of all errors

Priority 4: undefined in RequestListContentComponent

  • Impact: 3.2% of all errors

Priority 5: InternalError in ResponsePanel

  • File location: devtools/client/netmonitor/src/utils/request-utils.js:719:51
  • Impact: 2.7% of all errors

DevTools Toolbox Component (React) Errors (7-day analysis)

626 errors recorded from 2026-04-07 07:50 to 2026-05-24 23:33. Top issues: TypeError in EvaluationContextSelector (233 errors), TypeError in ConsoleSettings (167 errors), TypeError in HTMLPreview (28 errors). release channel represents 95.8% of errors. Windows accounts for 75.4% of errors.

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