If you're referring to point 3.11, then I don't agree. This is not the intent of this provision. This is clearly targeted at malware or other software that prevents the proper working of Facebook against the user's wishes. Otherwise, it would be a violation of their TOS to disable Javascript, change your font, or use custom CSS in your browser.

> This is clearly targeted at malware or other software that prevents the proper working of Facebook against the user's wishes.

Facebook could be defining anything that blocks or interferes with their advertising and revenue stream as malware.

He's explaining that he never accepted their TOS in the first place, because he never did anything that required him to.

It's pretty hard to develop an app that modifies the way a site is displayed to logged in users without being logged in to the site yourself...

Not true. I've created a browser extension that inserted a menu item to Facebook's menu for each facebook story. I didn't have to be signed in as a facebook developer to do that.

Now, develop and debug it without being able to use HTTP or test it with live data in any way.