wxt-browser-extensions
WXT browser extension performance optimization guidelines. This skill should be used when writing, reviewing, or refactoring WXT browser extension code to ensure optimal performance patterns. Triggers on tasks involving WXT, browser extensions, content scripts, service workers, messaging, and extension APIs.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/pproenca/dot-skills --skill wxt-browser-extensions- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads wxt-browser-extensions automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Community WXT Browser Extensions Best Practices
Comprehensive performance optimization guide for WXT browser extension development. Contains 49 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation. Updated for WXT v0.20+.
When to Apply
Reference these guidelines when:
- Writing new WXT browser extension code
- Implementing service worker background scripts
- Injecting content scripts into web pages
- Setting up messaging between extension contexts
- Configuring manifest permissions and resources
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Service Worker Lifecycle | CRITICAL | svc- |
| 2 | Content Script Injection | CRITICAL | inject- |
| 3 | Messaging Architecture | HIGH | msg- |
| 4 | Storage Patterns | HIGH | store- |
| 5 | Bundle Optimization | MEDIUM-HIGH | bundle- |
| 6 | Manifest Configuration | MEDIUM | manifest- |
| 7 | UI Performance | MEDIUM | ui- |
| 8 | TypeScript Patterns | LOW-MEDIUM | ts- |
Quick Reference
1. Service Worker Lifecycle (CRITICAL)
svc-register-listeners-synchronously- Register listeners synchronously to prevent missed eventssvc-avoid-global-state- Use storage instead of in-memory statesvc-keep-alive-patterns- Keep service worker alive for long operationssvc-handle-install-update- Handle install and update lifecycle eventssvc-offscreen-documents- Use offscreen documents for DOM operationssvc-declarative-net-request- Use declarative rules for network blocking
2. Content Script Injection (CRITICAL)
inject-use-main-function- Place runtime code inside main() functioninject-choose-correct-world- Select ISOLATED or MAIN world appropriatelyinject-run-at-timing- Configure appropriate runAt timinginject-use-ctx-invalidated- Handle context invalidation on updateinject-dynamic-registration- Use runtime registration for conditional injectioninject-all-frames- Configure allFrames for iframe handlinginject-spa-navigation- Handle SPA navigation with wxt:locationchange
3. Messaging Architecture (HIGH)
msg-type-safe-messaging- Use @webext-core/messaging for type-safe protocolsmsg-return-true-for-async- Return true for async message handlers (raw API)msg-use-tabs-sendmessage- Use tabs.sendMessage for content scriptsmsg-use-ports-for-streams- Use ports for streaming communicationmsg-handle-no-receiver- Handle missing message receiversmsg-avoid-circular-messages- Prevent circular message loops
4. Storage Patterns (HIGH)
store-use-define-item- Use storage.defineItem for type-safe accessstore-choose-storage-area- Select appropriate storage areastore-batch-operations- Group related data into single defineItemstore-watch-for-changes- Use watch() for reactive updatesstore-handle-quota-errors- Handle storage quota errorsstore-versioned-migrations- Use versioning for schema migrations
5. Bundle Optimization (MEDIUM-HIGH)
bundle-split-entrypoints- Split code by entrypointbundle-analyze-size- Analyze and monitor bundle sizebundle-tree-shake-icons- Use direct imports for icon librariesbundle-externalize-wasm- Load WASM dynamicallybundle-minify-content-scripts- Minimize content script size
6. Manifest Configuration (MEDIUM)
manifest-minimal-permissions- Request minimal permissionsmanifest-use-optional-permissions- Use optional permissions progressivelymanifest-web-accessible-resources- Scope web accessible resourcesmanifest-content-security-policy- Configure CSP correctlymanifest-cross-browser-compatibility- Support multiple browsers
7. UI Performance (MEDIUM)
ui-use-shadow-dom- Use Shadow DOM for injected UIui-defer-rendering- Defer popup rendering until neededui-cleanup-on-unmount- Clean up UI on unmountui-sidepanel-persistence- Preserve sidepanel stateui-position-fixed-iframe- Use iframe for complex UIui-avoid-layout-thrashing- Batch DOM reads and writes
8. TypeScript Patterns (LOW-MEDIUM)
ts-use-imports-module- Use #imports virtual module and auto-importsts-use-browser-not-chrome- Use browser namespace over chromets-type-entrypoint-options- Type entrypoint options explicitlyts-augment-browser-types- Augment types for missing APIsts-strict-null-checks- Enable strict null checksts-import-meta-env- Use import.meta for build infots-avoid-any- Avoid any type in handlersts-path-aliases- Use path aliases for imports
How to Use
Read individual reference files for detailed explanations and code examples:
- Section definitions - Category structure and impact levels
- Rule template - Template for adding new rules
Reference Files
| File | Description |
|---|---|
| references/_sections.md | Category definitions and ordering |
| assets/templates/_template.md | Template for new rules |
| metadata.json | Version and reference information |
FAQ
What does the wxt-browser-extensions skill do?
WXT browser extension performance optimization guidelines. This skill should be used when writing, reviewing, or refactoring WXT browser extension code to ensure optimal performance patterns. Triggers on tasks involving WXT, browser extensions, content scripts, service workers, messaging, and extension APIs.
How do I install wxt-browser-extensions?
Run npx skills add https://github.com/pproenca/dot-skills --skill wxt-browser-extensions in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/wxt-browser-extensions/ (personal) or .claude/skills/wxt-browser-extensions/ (project).
Which AI agents can use wxt-browser-extensions?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is wxt-browser-extensions safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains wxt-browser-extensions?
It is published by pproenca in pproenca/dot-skills. It has 1,084 recorded installs.
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