Browser Compatibility Tester
Cross-browser testing with Playwright, BrowserStack, Sauce Labs, LambdaTest, and Kobiton - test across Chrome, Firefox, Safari, Edge on real devices
- Type
- Plugin
- Repository
- jeremylongshore/tons-of-skills-marketplace
- GitHub stars
- 2.8k
- License
- MIT
- Repo last updated
- Sep 27, 2026
- Version
- 2.20.0
- Author
- Claude Code Plugin Hub
What Browser Compatibility Tester is
Browser Compatibility Tester is a plugin published in the jeremylongshore/tons-of-skills-marketplace repository on GitHub, which has about 2.8k stars. The repository describes itself as: “Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.”
A plugin is a package that bundles skills, slash commands, subagents, hooks, and MCP connectors so they install together. Plugins are plain files with a manifest at .claude-plugin/plugin.json, and they work in both Claude Code and Claude Cowork.
Installing Browser Compatibility Tester adds everything it ships in one step. Connectors inside a plugin still need to be connected separately, and hooks and subagents only run in Cowork and Claude Code, not in regular chat.
How to install Browser Compatibility Tester
Claude Code
- Add the repository as a plugin marketplace: claude plugin marketplace add jeremylongshore/tons-of-skills-marketplace
- Install the plugin: claude plugin install browser-compatibility-tester@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json.
- Restart the session if the new skills or commands don't appear straight away.
Claude Cowork
- Open Customize → Plugins and choose Add marketplace.
- Enter jeremylongshore/tons-of-skills-marketplace (the owner/repo shorthand works for GitHub).
- Find Browser Compatibility Tester in the list, click Install, then connect any connectors it needs from its Connectors tab.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from plugins/testing/browser-compatibility-tester/.claude-plugin/plugin.json, shared under the repository's MIT license. Read the full file on GitHub.
Cross-browser and cross-device testing powered by Playwright locally and four major cloud platforms (BrowserStack, Sauce Labs, LambdaTest, Kobiton) for real-device validation. Tests CSS rendering, JavaScript API support, layout consistency, and interactive behavior across Chrome, Firefox, Safari, and Edge on desktop and mobile.
Installation
/plugin install browser-compatibility-tester@claude-code-plugins-plusUsage
/browser-test
# or shortcut
/btSupported Providers
Features
- Multi-browser matrix -- Chrome, Firefox, Safari, Edge across desktop and mobile viewports
- Local-first workflow -- Playwright projects with parallel execution; no cloud account needed to start
- Cloud real-device testing -- Connect to BrowserStack, Sauce Labs, LambdaTest, or Kobiton when emulation is not enough
- Screenshot comparison -- Capture per-browser screenshots and flag visual regressions
- Compatibility scanning -- Grep for modern CSS/JS APIs and cross-reference against caniuse data
- CI/CD integration -- GitHub Actions and CircleCI workflow examples for every provider
- Accessibility checks -- Run axe-core audits per browser to catch engine-specific a11y gaps
Files
- commands/browser-test.md -- /browser-test slash command
- skills/testing-browser-compatibility/SKILL.md -- Auto-activating skill
- skills/testing-browser-compatibility/references/cloud-providers.md -- Provider auth, API, and capabilities reference
- skills/testing-browser-compatibility/references/device-matrix.md -- Browser/device/OS matrix patterns
- skills/testing-browser-compatibility/references/ci-cd-integration.md -- CI/CD workflow examples for all providers
License
MIT
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Browser Compatibility Tester?
Browser Compatibility Tester is a plugin for Claude Code and Claude Cowork from the jeremylongshore/tons-of-skills-marketplace repository on GitHub. Cross-browser testing with Playwright, BrowserStack, Sauce Labs, LambdaTest, and Kobiton - test across Chrome, Firefox, Safari, Edge on real devices
How do I install Browser Compatibility Tester in Claude Code?
Add the repository as a plugin marketplace: claude plugin marketplace add jeremylongshore/tons-of-skills-marketplace Install the plugin: claude plugin install browser-compatibility-tester@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json. Restart the session if the new skills or commands don't appear straight away.
Can I use Browser Compatibility Tester in Claude Cowork?
Open Customize → Plugins and choose Add marketplace. Enter jeremylongshore/tons-of-skills-marketplace (the owner/repo shorthand works for GitHub). Find Browser Compatibility Tester in the list, click Install, then connect any connectors it needs from its Connectors tab.
Is Browser Compatibility Tester safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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