Being an AngularJS based single page client app, new client does not support "Open link in new tab" option. However let us know the reason for using new tab for each monitor, which would help us resolve it without new tab option.
If you are opening each monitor's details page in a new tab to compare data between those monitors, we are going to implement compare report which would solve your need. In compare reports, you can select multiple monitors and their performance attributes, the values will be listed in a table in single page.
If you just want to check each monitor's details one by one, we can provide link to go to previous/next monitor from within details page itself, so that you don't need to go back list page to see next monitor.