toolbox_component_error_telemetry_summary_18_05_2026.md

DevTools Toolbox Error Analysis - Component (React) Errors

Period: 2026-03-14 22:07 to 2026-05-17 21:58 Total Errors: 595

Overview

The analysis reveals 595 component (React) errors, with the most common error being 'TypeError' (82.9%). 97.0% occur on release. Windows users account for 74.8% of all errors.

Platform Distribution

• Windows: 445 errors (74.8%)
• Linux: 111 errors (18.7%)
• Darwin: 39 errors (6.6%)

Channel Distribution

• release: 577 errors (97.0%)
• aurora: 14 errors (2.4%)
• beta: 3 errors (0.5%)
• default: 1 errors (0.2%)

Error Breakdown by Category

1. TypeError in EvaluationContextSelector - 241 errors (40.5%)

Component:

• Primary: EvaluationContextSelector

Error location:

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

Affected:

• Channels: release (238), aurora (2), default (1)
• Platforms: Windows (169), Linux (56), Darwin (16)

2. TypeError in ConsoleSettings - 188 errors (31.6%)

Component:

• Primary: ConsoleSettings

Error location:

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

Affected:

• Channels: release (186), aurora (2)
• Platforms: Windows (146), Linux (40), Darwin (2)

3. TypeError in HTMLPreview - 19 errors (3.2%)

Component:

• Primary: HTMLPreview

Error location:

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

Affected:

• Channels: release (19)
• Platforms: Darwin (11), Windows (8)

4. undefined in RequestListContentComponent - 18 errors (3.0%)

Component:

• Primary: RequestListContentComponent

Affected:

• Channels: release (18)
• Platforms: Windows (11), Linux (5), Darwin (2)

5. TypeError in MenuButton - 16 errors (2.7%)

Component:

• Primary: MenuButton

Error location:

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

Affected:

• Channels: release (16)
• Platforms: Windows (13), Darwin (2), Linux (1)

6. InternalError in ResponsePanel - 12 errors (2.0%)

Component:

• Primary: ResponsePanel

Error location:

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

Affected:

• Channels: release (8), aurora (4)
• Platforms: Windows (10), Linux (1), Darwin (1)

7. undefined in JSTerm - 9 errors (1.5%)

Component:

• Primary: JSTerm

Affected:

• Channels: release (9)
• Platforms: Windows (9)

8. undefined in Connect(MonitorPanel) - 9 errors (1.5%)

Component:

• Primary: Connect(MonitorPanel)

Affected:

• Channels: release (9)
• Platforms: Windows (7), Linux (2)

9. TypeError in RequestListColumnWaterfall - 6 errors (1.0%)

Component:

• Primary: RequestListColumnWaterfall

Error location:

requestData@resource://devtools/client/netmonitor/src/connector/index.js:525:5

Affected:

• Channels: release (6)
• Platforms: Windows (4), Linux (2)

10. InternalError in Connect(MonitorPanel) - 6 errors (1.0%)

Component:

• Primary: Connect(MonitorPanel)

Error location:

parseFilters@resource://devtools/client/netmonitor/src/utils/filter-text-utils.js:59:23

Affected:

• Channels: release (5), aurora (1)
• Platforms: Windows (6)

Top Error Types Summary

1. TypeError in EvaluationContextSelector - 241 occurrences (40.5%)
2. TypeError in ConsoleSettings - 188 occurrences (31.6%)
3. TypeError in HTMLPreview - 19 occurrences (3.2%)
4. undefined in RequestListContentComponent - 18 occurrences (3.0%)
5. TypeError in MenuButton - 16 occurrences (2.7%)
6. InternalError in ResponsePanel - 12 occurrences (2.0%)
7. undefined in JSTerm - 9 occurrences (1.5%)
8. undefined in Connect(MonitorPanel) - 9 occurrences (1.5%)
9. TypeError in RequestListColumnWaterfall - 6 occurrences (1.0%)
10. InternalError in Connect(MonitorPanel) - 6 occurrences (1.0%)

Actionable Insights

• 1. TypeError in EvaluationContextSelector accounts for 40.5% of all errors (241 occurrences)
• 2. release channel dominance: 97.0% of errors are from release
• 3. Platform-specific: TypeError in MenuButton is predominantly on Windows (13/16 errors)

Recommendations

Priority 1: TypeError in EvaluationContextSelector

• File location: devtools/client/fronts/targets/worker.js:35:5
• Impact: 40.5% of all errors

Priority 2: TypeError in ConsoleSettings

• File location: devtools/client/framework/toolbox.js:616:5
• Impact: 31.6% of all errors

Priority 3: TypeError in HTMLPreview

• File location: gre/modules/RemoteWebNavigation.sys.mjs:42:5
• Impact: 3.2% of all errors

Priority 4: undefined in RequestListContentComponent

• Impact: 3.0% of all errors

Priority 5: TypeError in MenuButton

• File location: devtools/client/shared/components/menu/MenuButton.js:135:17
• Impact: 2.7% of all errors

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

595 errors recorded from 2026-03-14 22:07 to 2026-05-17 21:58. Top issues: TypeError in EvaluationContextSelector (241 errors), TypeError in ConsoleSettings (188 errors), TypeError in HTMLPreview (19 errors). release channel represents 97.0% of errors. Windows accounts for 74.8% of errors.