Hi @howo, were you already aware of flag trail?
I think the functionality you provide here is more of less the same as @reazuliqbal's code but I do like that you have added the counter upvote functionality.
I had created something similar for a certain naughty whales self-votes a while back which was interesting.
Anyways, good luck with the project! Hopefully, with a diversity of tools available we will be able to make much more of a difference.
I was not actually, this is great I mostly built this because I wanted to have a tool ready asap after hf21 to allow people to downvote. The more tools built to downvotes the better imo.