Private browsing

Hello, is there a way to block using private browsing mode on android phone? Maybe with some add-ons or …

(This is not really the right place for this question)

What exactly do you mean by “block using private browsing mode”? You want to be unable to open private tabs?

I don’t see any reason why somebody would want to block that. so I doubt there is an extension that does that.
On the other hand it probably wouldn’t be too hard to write one that simply closes all private tabs as soon as they appear.

Yes, I want something to disable opening private tabs. Do you know how can I do it?Thanks in advance!

where exactly I have to place my question?

The way you asked your question it sounded like you were looking for an existing solution.

The Add-ons > Development section is for questions regarding add-ons development (go figure ^^ ).

If you intend to develop somethiong yourself this is in fact the correct forum.

Nope. I haven’t developed anything specifically for android yet. If you haven’t either (and maybe haven’t even developed an add-on at all) you should expect to spend at least 20 to 40 hours on this.
Here is a starting point:
https://developer.mozilla.org/en-US/Add-ons/Firefox_for_Android/Walkthrough

Yes, I need something already existing. Can you help me?

To my knowledge there is no such thing existing and I certainly won’t write it.