I'm sure my experience is not anything special, but it can't be repeated enough: THX Aurelien for compensating for Mozillas brilliant dev strategy. I guess the flat RSS code doesn't pay their bills and Pocket ( and Cliqz, and..., and...) does. Pity you had to spend your valuable time on it, and THX again you did...
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For people searching to address their RSS needs: this addon BRINGS BACK the ability to view RSS feeds like you were used to do before Mozilla decided to remove it with version 64. It works brilliantly in 99% of all feeds I follow. Have to admit that there are some "news" sites, where you can encounter a "Error loading stylesheet" [ == .xsl ], but reviewing code that seems to be more the fault of these (dare I say?) amateurish news organizations than of this addon.