If you are a Firefox user you will probably want to read this.
Starting in June 2019, extensions may no longer contain obfuscated code. Caitlin Neiman, Mozilla's Add-ons Community Manager notes that extensions may still use minified, concatenated or otherwise machine-generated code, but that the source code needs to be included and that obfuscation is not allowed anymore. Mozilla will improve the blocking process as well to block extensions "more proactively" if they violate policies.
