Check all existing tags for a certain tumblr

Before you start any implementation: check your field of interest for existing solutions! This may sound awkward, but re-inventing the wheel is not what you should do with you spare time!
I was thinking about a simple and easy way to fetch all existing tags for a certain tumblr. Since they are not presented directly in an obvious way testing the commonly used things like “me”, “myself” or “own” helps, but takes time.

Looks like Benjamnin Horn did something like this. Together with some explanation.
The working example for doing your “researches” can be found here.

Good work!