I couldn't think of anywhere more obvious to put this post, so I'll just put it here and see if anyone concurs...
The new Gallery is a straight step down from the old one. The loss (AFAICS) of Featured is a bit of a shame, but the loss of tabbed browsing and the awful embedded implementation is beyond annoying.
If we want Fusion 360 to take off it requires an active community, and one of the best ways to secure this is to provide a pleasant user interface experience, not only in the program itself, but also in its supporting online environment.
Suggestion is simple: revert changes to restore lost functionality, or retain changes but do what a lot of other sites (e.g. Youtube) do and allow 'open in new tab' as a keyboard+mouse shortcut (cmd+click) even when right click is disabled.
