This would be amazing. Could even be developed as a plugin?
Hi @sidianmorningstar
Thanks for reaching out and your suggestion!
We already have a Pinterest Style Grid Plugin that you can use for your repeating groups, here: Pinterest Style Grid Plugin for Bubble | Plugin for Bubble by Zeroqode
As for Pinterest browser extensions, unfortunately, our team is not developing them. Sorry for the inconvenience. 
Let me know if you have any other questions.
Best,
Gulce