Thank you @jga for making the tool! As you might have noticed, there is sort of a little bug report in there:

If it doesn't render properly try replacing the part after "username" with your own username in this URL: https://joticajulian.github.io/steem-activity/index.html?account=guttormf

I experienced that if I loaded an account with the account field, then the first part about the user would not show.