Decode Base64 Footer Please

I found a thread on this forum with a person who could decode Base64 encrypted php. Then I found another post on this forum outlining the extreme dangers potentially hidden within such encoding. I noticed that, that person had not responded to any requests in 2+ months, so I didn’t feel posting there was going to help me. I’m honestly quite scared of my theme now, even though I absolutely love it. Although I have noticed that whenever I load my page it is ‘waiting on …’ a lot of different pages that I have no links to or from, so now I’m even more concerned.

I tried the ‘echo’ method he/she listed on that thread, but with no positive results (probably due to lack of understanding on it)

Could someone decode this for me PLEASE! Thank You in advance.
https://mistermessa.pastebin.com/m725dc9ef