PlotJuggler 4 Perf Profiling
PlotJuggler/PlotJuggler
Guides CPU profiling of PlotJuggler 4 on Linux with perf: count first, record cheaply with LBR, then read per-thread, flat, flamegraph or time-window views.
Run Firefox performance tests locally or in CI. An agent skill from BrowserWorks/waterfox-android.
Install Perftest
$ npx skills add BrowserWorks/waterfox-android --skill perftest -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install BrowserWorks/waterfox-android perftest --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/BrowserWorks/waterfox-android.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/perftest .claude/skills/perftest && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "perftest" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftest into .claude/skills/perftest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perftest", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftestType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add BrowserWorks/waterfox-android --skill perftest -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install BrowserWorks/waterfox-android perftest --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BrowserWorks/waterfox-android.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/perftest .agents/skills/perftest && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "perftest" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftest into .agents/skills/perftest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perftest", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add BrowserWorks/waterfox-android --skill perftest -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install BrowserWorks/waterfox-android perftest --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BrowserWorks/waterfox-android.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/perftest .cursor/skills/perftest && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "perftest" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftest into .cursor/skills/perftest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perftest", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/BrowserWorks/waterfox-android.git --path .agents/skills/perftest--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add BrowserWorks/waterfox-android --skill perftest -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install BrowserWorks/waterfox-android perftest --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BrowserWorks/waterfox-android.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/perftest .gemini/skills/perftest && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "perftest" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftest into .gemini/skills/perftest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perftest", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install BrowserWorks/waterfox-android perftestInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add BrowserWorks/waterfox-android --skill perftest -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/BrowserWorks/waterfox-android.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/perftest .github/skills/perftest && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "perftest" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftest into .github/skills/perftest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perftest", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add BrowserWorks/waterfox-android --skill perftest -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install BrowserWorks/waterfox-android perftest --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/BrowserWorks/waterfox-android.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/perftest .opencode/skills/perftest && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "perftest" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/perftest into .opencode/skills/perftest/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "perftest", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
perftest- GitHub stars
- 379
- Used in
- 1 other repo
- Token cost
- ~2.3k tokens
- SKILL.md length
- 934 words
- Files
- 1
- Skills in repo
- 10
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Run Firefox performance tests locally or in CI. An agent skill from BrowserWorks/waterfox-android.
- The user asks how to run a perf test
- SKILL.md covers Local or CI? Check the…, Pick the harness, Run locally and Find a test's name, plus 4 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Wants to reproduce a performance alert
What it does
Perftest is an agent skill from BrowserWorks/waterfox-android. Run Firefox performance tests locally or in CI. Use when the user asks how to run a perf test, wants to reproduce a performance alert or regression locally, needs the mach invocation for Raptor, Talos, MozPerftest, AWSY, or browsertime, wants to push perf tests to try, or mentions mach try perf, mach perftest, mach raptor, mach talos-test, an alert summary ID, PerfCompare, or Compare View. Covers picking the right harness, finding a test's name, and the local-vs-CI tradeoff. Not for analyzing an existing Firefox…
Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Performance optimization. It works with Android and Linux.
When your agent uses it
- The user asks how to run a perf test
- Wants to reproduce a performance alert
- Regression locally
- Needs the mach invocation for Raptor
Example prompts
- “/perftest”
Requirements
- Pre-approved tools (allowed-tools): Bash(./mach perftest --help:*), Bash(./mach raptor --help:*), Bash(./mach raptor --print-tests:*), Bash(./mach talos-test --help:*), Bash(./mach talos-test --print-tests:*), Bash(./mach talos-test --print-suites:*), Bash(./mach awsy-test --help:*), Bash(./mach try perf --help:*), Bash(./mach try perf --no-push:*), Read, Grep, Glob
What it can do on your machine
Read from SKILL.md and the folder at commit 500d48c. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Bash(./mach perftest --help:*)Bash(./mach raptor --help:*)Bash(./mach raptor --print-tests:*)Bash(./mach talos-test --help:*)Bash(./mach talos-test --print-tests:*)Bash(./mach talos-test --print-suites:*)Bash(./mach awsy-test --help:*)Bash(./mach try perf --help:*)Bash(./mach try perf --no-push:*)Read
…and 2 more on the same allowed-tools line.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Perftest loads about 2.3k tokens when it runs. Until then it costs about 160 tokens; SKILL.md has 934 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 934 words (~2,274 tokens).
“Any of these tests can be run locally. Whether a local run will answer the question is a separate matter — check that first.”
- name
- perftest
- allowed-tools
- Bash(./mach perftest --help:*), Bash(./mach raptor --help:*), Bash(./mach raptor --print-tests:*), Bash(./mach talos-test --help:*), Bash(./mach talos-test --print-tests:*), Bash(./mach talos-test --print-suites:*), Bash(./mach awsy-test --help:*), Bash(./mach try perf --help:*), Bash(./mach try perf --no-push:*), Read, Grep, Glob
Files
Just SKILL.md in .agents/skills/perftest of BrowserWorks/waterfox-android.
Open the folder on GitHubat commit 500d48c
Used in 1 other repository
We found 3 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in BrowserWorks/waterfox-android, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Perftest next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Perftest this skillBrowserWorks/waterfox-android | 379 | 1 repos | ~2.3k | Automated safety check: Pass | Custom licence | |
| PlotJuggler 4 Perf ProfilingPlotJuggler/PlotJuggler | 6.2k | — | ~1.6k | Automated safety check: Notes | MPL-2.0 | |
| The Art of Debuggingstas00/the-art-of-debugging | 1.7k | — | ~6.1k | Automated safety check: Notes | CC-BY-SA-4.0 | |
| Linux perf Profiling Guideintel/intel-performance-skills | 332 | — | ~3.1k | Automated safety check: Notes | Custom licence | |
| Dotnet Debuggingnovotnyllc/dotnet-artisan | 233 | — | ~2.1k | Automated safety check: Pass | MIT | |
| Commitmanhpham90vn/Deskhub | 133 | — | ~978 | Automated safety check: Pass | MIT |
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Guides perf-based profiling of Linux programs through five flows: quick hardware counters, hotspot profiling, cache contention, core-scaling, and a report.
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Categories
Questions about Perftest
What does Perftest do?
Run Firefox performance tests locally or in CI. An agent skill from BrowserWorks/waterfox-android. Perftest is an agent skill from BrowserWorks/waterfox-android. Run Firefox performance tests locally or in CI.
When should I use Perftest?
Perftest fits situations like: the user asks how to run a perf test; wants to reproduce a performance alert; regression locally; needs the mach invocation for Raptor.
How do I install Perftest in Claude Code?
Run `npx skills add BrowserWorks/waterfox-android --skill perftest -a claude-code`. Or copy the skill folder (.agents/skills/perftest in BrowserWorks/waterfox-android) into .claude/skills/perftest in your project. Claude Code loads it when a task matches its description.
How do I install Perftest in Codex?
Run `npx skills add BrowserWorks/waterfox-android --skill perftest -a codex`. Or copy the skill folder (.agents/skills/perftest in BrowserWorks/waterfox-android) into .agents/skills/perftest in your project. Codex loads it when a task matches its description.
Can I use Perftest in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add BrowserWorks/waterfox-android --skill perftest -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/perftest, .gemini/skills/perftest, .github/skills/perftest and .opencode/skills/perftest in your project.
What does Perftest need to run?
SKILL.md names no scripts, command-line tools or credentials: Perftest is instructions for the agent only. Its frontmatter pre-approves these tools: Bash(./mach perftest --help:*), Bash(./mach raptor --help:*), Bash(./mach raptor --print-tests:*), Bash(./mach talos-test --help:*), Bash(./mach talos-test --print-tests:*), Bash(./mach talos-test --print-suites:*), Bash(./mach awsy-test --help:*), Bash(./mach try perf --help:*), Bash(./mach try perf --no-push:*), Read, Grep, Glob.
Does Perftest access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Perftest safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Perftest use?
Perftest has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Perftest use?
About 2.3k tokens (SKILL.md is roughly 9.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Perftest?
Skills that share tags, products or a category with Perftest: PlotJuggler 4 Perf Profiling (PlotJuggler/PlotJuggler, 6.2k stars), The Art of Debugging (stas00/the-art-of-debugging, 1.7k stars), Linux perf Profiling Guide (intel/intel-performance-skills, 332 stars) and Dotnet Debugging (novotnyllc/dotnet-artisan, 233 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Perftest?
BrowserWorks (a GitHub organization) maintains it in BrowserWorks/waterfox-android, which has 379 GitHub stars. The repository holds 10 skills in this directory. The repository was last updated on September 22, 2026.
Source: BrowserWorks/waterfox-android on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.