It seems like it would have worked, but the danger was over time Google report less and less information to the extension, but as it is today, the extension would have worked the same on v3 as v2?
As I say - I am ignorant sorry, its hard to search for an answer to this specific question
Edit: Sorry the answer is here: https://github.com/uBlockOrigin/uBOL-home/wiki/Frequently-as...