Using Relay Devtools in Firefox

Overview

1. The Relay Devtools extension is not supported on Firefox (issue)
2. Building the Firefox extension from the README causes multiple errors

Fixes

node-gyp error on Node 21

• Cause: build failure in the outdated fsevents package
• Fix: use Node 18 (nvm use 18)

Duplicate workspaces error on yarn v4

• Cause: differences between v1 and v4 workspace layouts
• Fix: use yarn v1 (yarn set version classic)

error:0308010C:digital envelope routines::unsupported during build

• Cause: webpack@v4 uses deprecated OpenSSL
• Fix: add NODE_OPTIONS=--openssl-legacy-provider

Installing shells/firefox/build/RelayDevTools.zip fails

• Cause: Firefox blocks unsigned extensions by policy
• Fix: follow the official guide for enabling unsigned extensions
  1. Install Firefox Developer Edition
  2. Go to about:config
  3. Set xpinstall.signatures.required to false