I've been looking for a replacement for the default RSS previewer since it was removed from Firefox. Most extensions require opening a sidebar or contain features I will never use.

The author states that "This extension attempts to recreate.." the original previewer. I'm happy to report that this extension is nearly indistinguishable from the original.

I would rate it more than 5 stars if I could.

If you are looking to replicate the default reader's preview functionality, this is the add-on you need.

Thank you to the author for making it!

Works perfectly. The only thing really missing is the button to import the feed into Thunderbird that used to be there. Not sure if it's possible to implement that with WebExtensions (probably not). Anyway, good job :)