@RL_Dane I made an extension a while ago that does exactly that - it puts the feed icon back in the URL bar.
Plus, it renders application/rss+xml, application/atom+xml and friends in a readable way when you open a feed URL in your browser - there was a time when browsers used to handle these content types, nowadays they just return the raw XML.
It’d be interesting if the folks at @mozilla have more insights on why they decided to drop the feed icon indicator in the URL bar as well as the support for rendering feed mimetypes - and why the timing of these decisions approximately matched the timing when Chrome dropped their support for those features.
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