Facebook bullies third-party apps Swipe and Simple Social into oblivion

What if someone creates a browser extension to change now Facebook looks? How is that any different from these apps? Why is it Facebook’s business what I do with their HTTP data that they send to me? For example social book post manager (https://chrome.google.com/webstore/detail/social-book-post-m...) lets you bulk delete your Facebook history, or at least it used to before Facebook’s repeated updates broke it. Isn’t that a “third party app” basically?

How is this different from allowing only "authorized" browsers on Facebook? Why does Facebook get to reach into user's computers and decide how they may process data that happens to originate from Facebook? Do I get to send a cease & desist to Facebook if they process a message of mine in a way I don't like?

I don't understand why Facebook just doesn't hire these people. Clearly they're doing a good enough job with their wrapper apps since the FB legal team perceives them as a threat.

This is a shame. I would never install the Facebook apps on my phone.