It looks like you can set a tab to always open in a certain container. The control panel for the extension is ctrl + .
Don't press the actually + (plus) button because pressing Ctrl + or Ctrl - will zoom in or out on a page but you can press Ctrl 0 (zero) to go back to the default zoom.
The first time you open the control panel there is a short tutorial. Be sure to read it because it says something about right-clicking that may interest you. I can't go back and look as the tutorial only came up once.