feat: add dev-firefox build-firefox npm scripts

scripts/utils.ts

@@ -5,6 +5,7 @@ export const port = parseInt(process.env.PORT || '') || 3303
 export const r = (...args: string[]) => resolve(__dirname, '..', ...args)
 export const isDev = process.env.NODE_ENV !== 'production'
 export const isWin = process.platform === 'win32'
+export const isFirefox = process.env.FIREFOX === 'true'
 
 export function log(name: string, message: string) {
   console.log(black(bgCyan(` ${name} `)), message)