This one would be the best addon ever made for the feed rss, if he did not show the raw xml page with some subscription... i hope for a improvement. Thank you!

Edit: good job! Now works very well, thank you so much!
P.S. would be extraordinary to have the dynamic icon for light/dark theme (or neutral for both, example a orange icon) and the option for to open the rss always in a new tab. Thank you again for the fix!