CLIActive

Extension.js CLI

Browser extension development CLI with global flags for telemetry control, machine-readable output, and cross-command consistency.

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Field note

What it does

Command-line interface for building browser extensions. Supports create, dev, start, preview, and build commands with global flags for telemetry opt-out, JSON/AI help output, browser control, and debug logging.

Capabilities

Available capabilities

Cross-command consistency Telemetry control AI/help formatting

Extension.js CLI

What it does

Available capabilities

Tags

Ways to use it

Product features

Automation contract (recommended)

Canonical Playwright flow (AI-friendly)

Common pitfalls

Development mode vs test mode

Important distinction: run mode vs readiness gate

Playwright E2E testing for extensions

Playwright testing capabilities

Practical guidance for extensions

Recommended baseline

Running tests

Typical setup

Why use it

What it does

Available capabilities

Tags

Ways to use it

Product features

​ Automation contract (recommended)

​ Canonical Playwright flow (AI-friendly)

​ Common pitfalls

​ Development mode vs test mode

​ Important distinction: run mode vs readiness gate

Playwright E2E testing for extensions

​ Playwright testing capabilities

​ Practical guidance for extensions

​ Recommended baseline

​ Running tests

​ Typical setup

​ Why use it

Automation contract (recommended)

Canonical Playwright flow (AI-friendly)

Common pitfalls

Development mode vs test mode

Important distinction: run mode vs readiness gate

Playwright testing capabilities

Practical guidance for extensions

Recommended baseline

Running tests

Typical setup

Why use it