Basically, you're not allowed to name extensions like insert funny extension name here and insert funny extension name here.

There are 3 questions, though.

#1
Are you allowed to name deleted, removed, or not existing extensions, like isO***ne?

#2
Are you allowed to say something, for example, like:

An0therRand0mC0der wrote:

Hey, I found this cool extension! It's really amazing, and you need to download it, but unfortunately, I can't name extensions.

But, then, the person who was notified about the existence of the "cool extension that he can't name" might be tempted to look for the extension, and then download it afterwards.

#3
Are you allowed to say the name of an extension which is made for Scratch in a different website, program, or app?

1. Probably, since it's impossible for someone to install the extension.

2. I'm not entirely sure, but considering a lot of people in the ATs indirectly mention extensions without the posts getting deleted, I assume it's allowed.

3. That is allowed, as the Scratch Team's rules can't be enforced on other platforms.

2. I mean, we can say temporary attachment to refer to a certain extension, so of course.