In FF83 beta8, when I select search.json.mozlz4 file in "Export all search engines to a json file" menu, "The selected search.json.mozlz4 file is not valid" error message is displayed. mozlz4-edit extension don't have this problem, it works well, so it is not my search.json.mozlz4 problem.
You are very welcome, and thanks for the heads-up! If you wish, you can also open issues directly in the github page: https://github.com/soufianesakhi/firefox-search-engines-helper/issues so that I respond to it more quickly :)
