Open DL links in a new tab
When you click on a link that refers to another DL address it opens in the current tab not in a new tab and that leads to losing your current practice.
Personally, I prefer how it works. Clearly when I click for an external link I want it to open in another tab because I don't want to quit Duolingo. But I don't want that Duolingo opens an internal link in another tab. When I navigate in Duolingo, I pass from one page to another without wanting to keep the former page and when I want to keep it, I use de CTRL+click thing.