I don't think so. (And the cynic in me suggests that the fewer user-selectable options we have, the more reliable the site is likely to be.)
On the old site, observations always opened in a new tab and this was changed in the new version. Unfortunately, if you opened an observation in the same tab, the [back] button would take you to the top of the page of observations rather than back to the position on the page where you were before. A lot of time had to be wasted scrolling down to get back to your previous position: I found that a bit of a pest.