Feature/add customization for browsers visible in window

[qwertyuiopzxcvbnmlkjhgfdsa1]

This change provides customization, so user is able to change how many browsers will be visible in child window.

I have more than original 4 browsers.

To be in setting later(hopefully)

Example:

[sonnyp]

Thanks for the contribution. I have a new version of Junction in the work which will have a scrollable list and search.

It will remove the need for this.