> The "rss support" was a folder, filled with links named after the article titles.
You're describing the "live bookmarks" feature, which was only one part of the RSS functionality that was removed from Firefox. I never used live bookmarks, but I used the feed discovery and subscription functionality all the time -- only some of which can now be restored with addons.
They also removed the ability to preview RSS feeds, which is annoying because one of the few certain ways to subscribe to a feed was to preview it and then hit subscribe in whatever addon you were using.
In the past it was even possible to subscribe with whatever addon you prefered from the firefox RSS preview directly, but that was already lost after the jump to WebExtensions.
You're describing the "live bookmarks" feature, which was only one part of the RSS functionality that was removed from Firefox. I never used live bookmarks, but I used the feed discovery and subscription functionality all the time -- only some of which can now be restored with addons.