jscpd Code Migration Tracker
kucherenko/jscpd
Measures a code port between languages or frameworks with jscpd's function-level comparison, porting tests before code and tracking what is left unmatched.
You MUST use this skill when working with Firefox's linting infrastructure (mozlint), adding new linters, modifying existing linters, running linters, or dealing with linting issues.
Install Mozlint
$ npx skills add BrowserWorks/waterfox-android --skill mozlint -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install BrowserWorks/waterfox-android mozlint --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/mozlint .claude/skills/mozlint && 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 "mozlint" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/mozlint into .claude/skills/mozlint/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mozlint", 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/mozlintType 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 mozlint -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install BrowserWorks/waterfox-android mozlint --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/mozlint .agents/skills/mozlint && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "mozlint" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/mozlint into .agents/skills/mozlint/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mozlint", 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 mozlint -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install BrowserWorks/waterfox-android mozlint --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/mozlint .cursor/skills/mozlint && 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 "mozlint" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/mozlint into .cursor/skills/mozlint/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mozlint", 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/mozlint--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 mozlint -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install BrowserWorks/waterfox-android mozlint --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/mozlint .gemini/skills/mozlint && 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 "mozlint" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/mozlint into .gemini/skills/mozlint/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mozlint", 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 mozlintInstalls 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 mozlint -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/mozlint .github/skills/mozlint && 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 "mozlint" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/mozlint into .github/skills/mozlint/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mozlint", 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 mozlint -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 mozlint --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/mozlint .opencode/skills/mozlint && 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 "mozlint" agent skill from https://github.com/BrowserWorks/waterfox-android/tree/main/.agents/skills/mozlint into .opencode/skills/mozlint/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "mozlint", 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
mozlint- GitHub stars
- 379
- Used in
- 2 other repos
- Token cost
- ~1k tokens
- SKILL.md length
- 496 words
- Files
- 1
- Skills in repo
- 10
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
You MUST use this skill when working with Firefox's linting infrastructure (mozlint), adding new linters, modifying existing linters, running linters, or dealing with linting issues.
- Works in 3 steps: Create a YAML configuration in tools/lint/ → If it's a custom linter, implement the… → Add tests in tools/lint/test/
- Working with Firefoxs linting infrastructure (mozlint)
- SKILL.md covers Overview, Workflow, Adding New Linters and Common Linters, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Mozlint is an agent skill from BrowserWorks/waterfox-android. You MUST use this skill when working with Firefox's linting infrastructure (mozlint), adding new linters, modifying existing linters, running linters, or dealing with linting issues.
Its SKILL.md is about 1k 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 Linting and formatting. It works with Python, Rust, ESLint and Android.
When your agent uses it
- Working with Firefoxs linting infrastructure (mozlint)
- Adding new linters
- Modifying existing linters
- Running linters
Example prompts
- “/mozlint”
Requirements
- Python 3
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Create a YAML configuration in tools/lint/
- If it's a custom linter, implement the Python module in tools/lint/python/ (or add a check to tools/lint/mozcheck/ for fast file checks)
- Add tests in tools/lint/test/
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 nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
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
Mozlint loads about 1k tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 496 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 496 words (~1,029 tokens).
“Firefox's linting infrastructure (mozlint) provides a unified way to run various linters across the codebase. It integrates multiple linters including ESLint, Stylelint, ruff, clippy, clang-format, and many others.”
- name
- mozlint
Files
Just SKILL.md in .agents/skills/mozlint of BrowserWorks/waterfox-android.
Open the folder on GitHubat commit 500d48c
Used in 3 other repositories
We found 7 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in BrowserWorks/waterfox-android, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Mozlint 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 |
|---|---|---|---|---|---|---|
| Mozlint this skillBrowserWorks/waterfox-android | 379 | 2 repos | ~1k | Automated safety check: Pass | Custom licence | |
| jscpd Code Migration Trackerkucherenko/jscpd | 6.4k | — | ~5k | Automated safety check: Pass | MIT | |
| Flowmark Markdown Formatterjlevy/repren | 374 | — | ~631 | Automated safety check: Pass | MIT | |
| Ha Code QualityFutureTense/keymaster | 349 | — | ~462 | Automated safety check: Pass | MIT | |
| Cb Code QualityBlkLeg/CircuitBreaker | 201 | — | ~1.9k | Automated safety check: Pass | MIT | |
| Code Qualitywaybarrios/opencode-power-pack | 533 | — | ~1.8k | Automated safety check: Pass | MIT |
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Ha Code Quality
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Standards and commands for linting, code formatting, typing validation (Ruff, MyPy, Codespell, ESLint, Pre-commit/Prek, Tox), and adherence to Home Assistant Python 3.14 standards in Keymaster.
Cb Code Quality
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Circuit Breaker code conventions and the quality gates that actually block a push — ruff, mypy, eslint, the pytest coverage ratchet, and the make verify tiers.
Code Quality
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Agents should invoke this skill for code reviews, linting/formatting setup, maintainability checks, complexity concerns, warning cleanup, coding standards, or quality gates in Rust, TypeScript…
Precheck
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PR 作成前の lint + format + test 一括実行。引数で scope (python/rust/cs/go/js/cpp/all) を指定可能。未指定なら git diff から自動判定。
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Related
Categories
Questions about Mozlint
What does Mozlint do?
You MUST use this skill when working with Firefox's linting infrastructure (mozlint), adding new linters, modifying existing linters, running linters, or dealing with linting issues. Mozlint is an agent skill from BrowserWorks/waterfox-android. You MUST use this skill when working with Firefox's linting infrastructure (mozlint), adding new linters, modifying existing linters, running linters, or dealing with linting issues.
When should I use Mozlint?
Mozlint fits situations like: working with Firefoxs linting infrastructure (mozlint); adding new linters; modifying existing linters; running linters.
How do I install Mozlint in Claude Code?
Run `npx skills add BrowserWorks/waterfox-android --skill mozlint -a claude-code`. Or copy the skill folder (.agents/skills/mozlint in BrowserWorks/waterfox-android) into .claude/skills/mozlint in your project. Claude Code loads it when a task matches its description.
How do I install Mozlint in Codex?
Run `npx skills add BrowserWorks/waterfox-android --skill mozlint -a codex`. Or copy the skill folder (.agents/skills/mozlint in BrowserWorks/waterfox-android) into .agents/skills/mozlint in your project. Codex loads it when a task matches its description.
Can I use Mozlint 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 mozlint -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mozlint, .gemini/skills/mozlint, .github/skills/mozlint and .opencode/skills/mozlint in your project.
What does Mozlint need to run?
SKILL.md names no scripts, command-line tools or credentials: Mozlint is instructions for the agent only. Our summary lists: Python 3.
Does Mozlint 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 Mozlint 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 Mozlint use?
Mozlint 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 Mozlint use?
About 1k tokens (SKILL.md is roughly 4.1k 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 Mozlint?
Skills that share tags, products or a category with Mozlint: jscpd Code Migration Tracker (kucherenko/jscpd, 6.4k stars), Flowmark Markdown Formatter (jlevy/repren, 374 stars), Ha Code Quality (FutureTense/keymaster, 349 stars) and Cb Code Quality (BlkLeg/CircuitBreaker, 201 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Mozlint?
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.