Firefox removes core product support for RSS/Atom feeds
Found on Gijsk on Friday, 12 October 2018
After considering the maintenance, performance and security costs of the feed preview and subscription features in Firefox, we’ve concluded that it is no longer sustainable to keep feed support in the core of the product. While we still believe in RSS and support the goals of open, interoperable formats on the Web, we strongly believe that the best way to meet the needs of RSS and its users is via WebExtensions.
Likewise, the feed viewer has its own “special” XML parser, distinct from the main Firefox one, and has not had a significant update in styling or functionality in the last seven years.
Styling RSS feeds? What for? To stuff annoying advertising and tracking into the textblocks? Maintaining your own "special" XML parser is like maintaining your own "special" encryption: in other words, pretty much a really bad idea.