Can you get plug ins on your phone or is it only on a computer or laptop. If you can get them on your phone than how?
Yes, there are script managers for both iOS and Android.
How would I get them because i wouldn’t know where to start
From the applicable App Store for your phone.
The wayfarer discord can help with these things if you get stuck.
On Android I have to use Firefox Nightly with I think Tamper Monkey installed.