Hi I recommend that you install an add-on called Home Feeds. I have used it myself to view RSS feeds in Firefox for Android and I really like it. You can read more about it [https://addons.mozilla.org/en-GB/android/addon/home-feeds/ here]. If you need a hand installing an add-on into Firefox for Android, I recommend you have a read of this [https://support.mozilla.org/en-US/kb/find-and-install-add-ons-firefox-android article]. I hope this helps, but if not, please come back here and we can look into a different solution for you.