As well as almost all regular software is backed by some large company with legal presence to hold responsible. The same can not be said for most extensions.
This is also true of web extensions. I suspect you've never developed one. You can't read another extension's data. It's also not true on desktop platforms. The user is still the security domain in desktop computing.
> As well as almost all regular software is backed by some large company with legal presence to hold responsible. The same can not [sic] be said for most extensions.
Is this true? All the browser extensions I use are published by a real legal entity that can be sued if they are negligent. What corner of the web are you on?