dulingo,com Discussion Stream: Cannot open another discussion stream in a new pane.

duoling.som_ds_bug

# Problem description

By default I, and I assume every one else, cannot open another "Discussion Stream" in a new pane.

# Expected behaviour

I can open a "New" Discussion Stream and/or a "Followed" Discussion Stream in a new browser pane from a "Popular" Discussion Stream.

The action is known as following a link on a HTML page.

# What I got / Erroneous behaviour

I can't follow the link. 
If I copy the link, and paste it into the address line of a newly opened pane , I get ";".

## An example

Example link:

Open https://www.duolingo.com/topic/2 

Try to open Discussion Stream "New" or "Followed" in **an a new browser pane**.

# Where

I discovered the error in the "Spanish Discussion Stream", and it seems that all discussion streams are affected by this error. 

# What is the error

A JavaScript function doesn't work.: 

hint:
<a href="javascript:;">Followed</a>

### CSS selector: 

#following > a:nth-child(1)

# JavaScript blocker

JavaScripts - and those included from other web sites - are **not** blocked on Duolingo.com

# Something works:

Following a link to another Discussion stream *replaces* the web page, that is, normal behaviour - but I don't want to do that: I want to open that link in a new pane.

# Browser

Firefox 50.1.0