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Created March 30, 2026 12:38
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toolbox_component_error_telemetry_summary_30_03_2026.md

DevTools Toolbox Error Analysis - Component (React) Errors

Period: 2026-03-16 05:58 to 2026-03-29 22:39 Total Errors: 163

Overview

The analysis reveals 163 component (React) errors, with the most common error being 'TypeError' (77.3%). 76.1% occur on release. Windows users account for 84.0% of all errors.

Platform Distribution

  • Windows: 137 errors (84.0%)
  • Darwin: 18 errors (11.0%)
  • Linux: 8 errors (4.9%)

Channel Distribution

  • release: 124 errors (76.1%)
  • aurora: 26 errors (16.0%)
  • default: 8 errors (4.9%)
  • nightly: 4 errors (2.5%)
  • beta: 1 errors (0.6%)

Error Breakdown by Category

1. TypeError in EvaluationContextSelector - 64 errors (39.3%)

Component:

  • Primary: EvaluationContextSelector

Error location:

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

Affected:

  • Channels: release (52), aurora (9), nightly (3)
  • Platforms: Windows (59), Darwin (3), Linux (2)

2. TypeError in ConsoleSettings - 37 errors (22.7%)

Component:

  • Primary: ConsoleSettings

Error location:

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

Affected:

  • Channels: release (32), aurora (4), beta (1)
  • Platforms: Windows (36), Darwin (1)

3. TypeError in HTMLPreview - 8 errors (4.9%)

Component:

  • Primary: HTMLPreview

Error location:

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

Affected:

  • Channels: aurora (7), release (1)
  • Platforms: Windows (7), Darwin (1)

4. InternalError in ResponsePanel - 7 errors (4.3%)

Component:

  • Primary: ResponsePanel

Error location:

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

Affected:

  • Channels: release (5), aurora (2)
  • Platforms: Linux (5), Windows (2)

5. undefined in JSTerm - 5 errors (3.1%)

Component:

  • Primary: JSTerm

Affected:

  • Channels: release (5)
  • Platforms: Windows (5)

6. undefined in RequestListContentComponent - 3 errors (1.8%)

Component:

  • Primary: RequestListContentComponent

Affected:

  • Channels: aurora (2), release (1)
  • Platforms: Windows (3)

7. InternalError in EvaluationContextSelector - 2 errors (1.2%)

Component:

  • Primary: EvaluationContextSelector

Error location:

get isContentProcess@resource://devtools/client/fronts/targets/target-mixin.js:327:31

Affected:

  • Channels: release (2)
  • Platforms: Windows (2)

8. TypeError in MenuButton - 2 errors (1.2%)

Component:

  • Primary: MenuButton

Error location:

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

Affected:

  • Channels: aurora (1), release (1)
  • Platforms: Darwin (2)

9. undefined in ToolboxTab - 2 errors (1.2%)

Component:

  • Primary: ToolboxTab

Affected:

  • Channels: release (2)
  • Platforms: Windows (2)

10. TypeError in ToolboxToolbar - 2 errors (1.2%)

Component:

  • Primary: ToolboxToolbar

Error location:

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

Affected:

  • Channels: nightly (1), release (1)
  • Platforms: Windows (2)

Top Error Types Summary

  1. TypeError in EvaluationContextSelector - 64 occurrences (39.3%)
  2. TypeError in ConsoleSettings - 37 occurrences (22.7%)
  3. TypeError in HTMLPreview - 8 occurrences (4.9%)
  4. InternalError in ResponsePanel - 7 occurrences (4.3%)
  5. undefined in JSTerm - 5 occurrences (3.1%)
  6. undefined in RequestListContentComponent - 3 occurrences (1.8%)
  7. InternalError in EvaluationContextSelector - 2 occurrences (1.2%)
  8. TypeError in MenuButton - 2 occurrences (1.2%)
  9. undefined in ToolboxTab - 2 occurrences (1.2%)
  10. TypeError in ToolboxToolbar - 2 occurrences (1.2%)

Actionable Insights

    1. TypeError in EvaluationContextSelector accounts for 39.3% of all errors (64 occurrences)
    1. release channel dominance: 76.1% of errors are from release
    1. Platform-specific: TypeError in EvaluationContextSelector is predominantly on Windows (59/64 errors)

Recommendations

Priority 1: TypeError in EvaluationContextSelector

  • File location: devtools/client/fronts/targets/worker.js:35:5
  • Impact: 39.3% of all errors

Priority 2: TypeError in ConsoleSettings

  • File location: devtools/client/framework/toolbox.js:616:5
  • Impact: 22.7% of all errors

Priority 3: TypeError in HTMLPreview

  • File location: gre/modules/RemoteWebNavigation.sys.mjs:42:5
  • Impact: 4.9% of all errors

Priority 4: InternalError in ResponsePanel

  • File location: devtools/client/netmonitor/src/utils/request-utils.js:719:51
  • Impact: 4.3% of all errors

Priority 5: undefined in JSTerm

  • Impact: 3.1% of all errors

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

163 errors recorded from 2026-03-16 05:58 to 2026-03-29 22:39. Top issues: TypeError in EvaluationContextSelector (64 errors), TypeError in ConsoleSettings (37 errors), TypeError in HTMLPreview (8 errors). release channel represents 76.1% of errors. Windows accounts for 84.0% of errors.

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