Build from Source

VulpineOS is a fork of Camoufox , itself based on Firefox 146.0.1. The build system uses Make targets that orchestrate Firefox’s mach build tool.

Prerequisites

macOS (Apple Silicon or Intel) or Linux (x86_64)
Python 3.10+ — required by Firefox’s mach build system
Go 1.26+ — for the TUI binary
Node.js 18+ — for OpenClaw
~40 GB disk space for the Firefox source tree + build artifacts

macOS Additional


xcode-select --install
brew install mercurial yasm

Linux Additional


sudo apt install build-essential libgtk-3-dev libdbus-glib-1-dev \
  yasm nasm python3-pip

Build Steps

1. Fetch Source


make fetch

Downloads the Firefox 146.0.1 source tarball (~300 MB).

2. Setup


make setup

Extracts the tarball and initializes a git repository inside the source tree (used for tracking patch application).

3. Apply Patches + Additions


make dir

This runs scripts/patch.py to apply all unified diffs from patches/ and scripts/copy-additions.sh to copy new files from additions/ into the Firefox source tree.

Key patches:

action-lock.patch — C++ page freeze (nsDocShell)
Camoufox fingerprinting patches (inherited)

Key additions:

additions/juggler/ — the entire Juggler automation layer
additions/juggler/TelemetryService.js — VulpineOS telemetry
additions/juggler/TrustWarmService.js — trust warming

4. Compile


make build

Runs ./mach build inside the Firefox source tree. On Apple Silicon with artifact builds enabled, this takes roughly 5 minutes. Full builds on Linux take 30-60 minutes.

5. Build the Go Binary


go build -o vulpineos ./cmd/vulpineos

Produces a ~11 MB binary with the full TUI, remote connectivity, MCP server, and orchestrator.

6. Install OpenClaw


npm install

Installs OpenClaw as a dependency (configured in the repo’s package.json).

7. Package (macOS)


make package-macos

Creates a distributable .app bundle.

Repository Structure


VulpineOS/
├── patches/           # Unified diffs applied to Firefox source
├── additions/         # New files copied into Firefox source tree
│   └── juggler/       # Playwright wire protocol + VulpineOS services
├── settings/          # Preferences (camoufox.cfg) and branding
├── scripts/           # Build orchestration (patch.py, copy-additions.sh)
├── cmd/vulpineos/     # Go CLI entry point
├── internal/          # Go packages (TUI, kernel, vault, pool, etc.)
├── go.mod
├── package.json       # OpenClaw dependency
└── Makefile

Artifact Builds

On macOS with Apple Silicon, Firefox supports artifact builds that download precompiled C++ components and only rebuild JavaScript/resource changes. This reduces build time from 30+ minutes to under 5 minutes. VulpineOS’s make build uses this automatically when available.