How to make Firefox to Open Popup as a New Tab

The following procedure will make Firefox to open popup as a new tab.

1. Launch Firefox, type
   about:config
   
   into the location bar, and hit the Enter key.


2. Click the "I'll be careful, I promise!" button.


3. Type
   browser.link.open_newwindow.restriction
   
   into the filter bar.


4. Right click on the result, choose "Modify". Change the integer value to 0. The default is 2. Click OK.


5. Finally, restart Firefox.

Now, all popup will open as a new tab.