I built myself an extension. Just for myself, nobody else. It worked great, then in one of these "policy changes" I couldn't use it anymore. Just for myself. That is a betrayal of trust. If I could use it before, and now I need to hack/mod Firefox by building it on a machine with umpteen hundreds of gigabytes of storage, that is a betrayal of trust. Firefox is "demonstrably" a hermetically sealed product. As demonstrated by my lived experience.