Update firefox-esr from 78.8.0 to 78.9.0 (#10660)
Update firefox-esr from 78.8.0 to 78.9.0 (#10660)

* Update firefox-esr from 78.8.0 to 78.9.0

* Update firefox-esr.rb

Co-authored-by: Miccal Matthews <a53b0df86fcdccc56e90f3003dd9230c49f140c6@gmail.com>
pkq/homebrew-versions,mahori/homebrew-cask-versions,404NetworkError/homebrew-versions,404NetworkError/homebrew-versions,pkq/homebrew-versions