message: chore: update ff pack script
diff: const fs = require('fs-extra')
  const path = require('path')
  +main()
  +
  +async function main() {
  // FF policy
  -fs.remove(path.join(__dirname, '../build/firefox/assets/fanyi.youdao.2.0'))
  + await fs.remove(
  + path.join(__dirname, '../build/firefox/assets/fanyi.youdao.2.0')
  + )
  + // Stop FF extension check errors
  + await fs.outputFile(
  + path.join(__dirname, '../build/firefox/assets/fanyi.youdao.2.0/main.js'),
  + ''
  + )
  +}
  