profiler-analysis

Analyze Firefox performance profiles using the profiler-cli CLI tool. Trigger when given a profiler.firefox.com or share.firefox.dev link, a local profile path, or when the user wants to investigate an issue in a Firefox profile. Always use this skill instead of WebFetch for Firefox profiler URLs; WebFetch only retrieves the profiler UI's HTML shell and cannot access profile data, whereas profiler-cli downloads and parses the actual profile into a local daemon that supports structured queries over stacks, markers, threads, and samples.

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Evaluation results

100%

Firefox Profile Investigation Request

Non-shareable profile URL handling

Criteria

Without context

With context

Identifies non-shareable URL type

100%

Explains local-storage limitation

100%

No load attempt

100%

No WebFetch attempt

100%

Share button instruction

100%

Correct shareable URL formats

100%

Local file path alternative

100%

80%

38%

Firefox macOS Startup Slowness Investigation

Full profiler-cli analysis workflow

Criteria

Without context

With context

Guide run first

100%

profiler-cli load (not WebFetch)

46%

100%

Glob used for case studies

Relevant case study selected

Thread selection performed

100%

Sample analysis commands used

100%

Marker analysis performed

100%

profiler-cli stop called

100%

Results interpreted (not just printed)

100%

Root cause identified

100%

80%

60%

Firefox Browser Hang Investigation

Extension hang root-cause analysis

Criteria

Without context

With context

Guide run before analysis

100%

profiler-cli load (not WebFetch)

100%

Glob used for references

Appropriate case study identified

Thread selection used

100%

Top-down or bottom-up sample tree used

100%

profiler-cli stop called

100%

Commands executed and interpreted

100%

Root cause identified

100%

Next steps suggested

100%

Repository: mozilla/enterprise-firefox
Commit: 31bc07f

Evaluated: 14 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Firefox Profile Investigation Request Firefox macOS Startup Slowness Investigation Firefox Browser Hang Investigation

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