Given these cases, why would XML files be any different?
Why not?
Why shouldn't browsers display at least the most common image, document and media types (including spreadsheets?) Why only display a few content-types but download all others? Content is the point of the web, after all.
RSS isn't used by people to make the main product of a browser better.
Why? Because their clients don't ask for them. RSS feeds are used for social media content sharing, but not for regular users.
Also, most blog content these days (for my clients) tends to be pretty canned stuff only used for SEO and content-bling to make some site look important.
I think sites that are serious about followers may use RSS, but not the majority of sites out there. Which leads us to why RSS support isn't needed anymore and can be relegated to an extension... popularity.
Perspective has nothing to do with it, implementing RSS/Atom is incredibly simple for most use cases when you build websites for a living...
Also, all of the sites I build have RSS built into them automatically because of the framework running them.
It's just that no one cares. RSS has never been requested by an end client (owner of the site) in any site I have built in almost 20 years.
But, when the social media and marketing people get involved, they used RSS as a way to share content with other 3rd party services.
RSS reader in Firefox as an extension is a perfect solution.
I understand getting rid of XUL legacy cruft, but removing the RSS renderer/reader entirely with no plan other than "extensions will fix it" just leaves a bad taste.
It might not be a core functionality of a browser, but all major browser vendors now accept that browsers are also development tools.
Mozilla has a finite budget to allocate to features. Maybe they looked at usage rates and decided that RSS just wasn't an important feature, or other features were more important.
uh huh