Yes. I have started using Firefox as an alternative to safari. Now, my phone does not heat up while browsing. Maybe it has to do with the trackers and endless advertisements which the Safari cannot block.For me the solution has been using orher broswers such as Edge and Duckduck go that block the trackers, specially in some sites like these forums, my phone used to get quite warm after a few minutes of just browsing, but using those browsers that have stronger tracker prevention I have regained the trust of my iPhone not getting hot by doing menial stuff. Safari is a little poor to prevent abusive trackers from running like crazy.