New tab and New Browser issue in Ui path in workflow

I have use Attached browser for IE for new window i was able to do the action

  1. But in firefox same steps once click on a web element a new window opens ! and i even have used Attached browser/window but now its not working ?? Guess title not same or selector not what would be the main reason??

b) i am not seeing any seeting in chrome or Edge to open in new window instead of new tab is there a way ??

  1. If i want to scroll till middle of the page and stop and do some action what key to use , if i use pagedown it just went one or two step down??