I don't get why it requires to be loaded as a temporary extension in order to work. Both Chrome and Firefox nowadays only allow permanent installation for exten

I don't get why it requires to be loaded as a temporary extension in order to work. Both Chrome and Firefox nowadays only allow permanent installation for extensions that are present on the store. I know that both the Mozilla and Chrome stores have become increasingly strict in terms of what the uploaded extensions can do (I've gone through a quite bumpy road to get my extension published), but if you submit the extension to them and make sure that it is compliant with their policies I think that there would be no need to manually load the manifest from developer mode.