Everything Mario77 says is 100% accurate. No idea why the developer would want to make RSS more complex than it needs to be.

Too little configuration options for the popup.
I want to have the feeds grouped by source in the popup. In subfolders. And I want to display all feeds in the popup. Just like the regular live bookmarks by Mozilla.
Unfortunately, the author did not integrate such basic functionality. I'd really appreciate a more sophisticated and customizable popup. But as is, the original Firefox live bookmarks + LiveClick is still a hundred times more convenient than this addon.

Answer to author response: No, this can still be very good UI design. Have you tried out Firefox live bookmarks + LiveClick? You could click the bookmark popup and saw everything you needed in one single popup. You didn't have to open a new tab just for the feed overview. It was a dream. Unfortunately, Mozilla set everything on fire and LiveClick was one of the victims. Now we are looking for an alternative. But most other addons don't share the simplicity of LiveClick. They all have overloaded designs and you need to open a separate tab just to see an overview of live bookmarks. That's what I call a bad UI design.

Here is an image how you addon could be designed if you were interested in a very good UI: https://addons.cdn.mozilla.net/user-media/previews/full/54/54655.png

@ Developer(s):"Come possiamo migliorare questo prodotto?"
IT: Un' ottima estensione per FF, quindi un grande elogio agli sviluppatori e 3** di 5! 2 ** Deduzione, poiché l' intero menu è solo in inglese. Multilingue (compreso il tedesco) = 5**

DE/A/CH: Eine sehr gute Erweiterung für FF, daher ein grosses Lob an den bzw. die Entwickler und 3** von 5! 2 ** Abzug, da die gesamte Menüführung lediglich in Englisch ist. Multilingual (inklusive Deutsch) = 5**

UK: A very good extension for FF, therefore a big praise to the developer (s) and 3** of 5! 2 ** Deduction, since the entire menu is only in English. Multilingual (including German) = 5**

ES: Una muy buena extensión para FF, por lo tanto un gran elogio a los desarrolladores y 3** de 5! 2 ** Deducción, ya que todo el menú es sólo en inglés. Multilingüe (incluido el alemán) = 5**

FR: Une très bonne extension pour FF, donc un gros compliment aux développeurs et 3** de 5! 2 ** Déduction, puisque le menu complet n'est qu'en anglais. Multilingue (y compris l'allemand) = 5**

Soddisfaciente

FEEDBRO is a hell of thousand tracking cookies invading privacy. Nowadays this is also a dangerous cybersecurity problem.

I tested FEEDBRO by blocking all cookies in FF. And all my feeds worked perfect at FEEDBRO. No cookies at all.
But the problem is that I need cookies enabled at FF.
So, if FEEDBRO works with cookies blocked, why FEEDBRO doesn't block cookies by it self?

In fact, in the option or settings page, FEEDBRO can block scripts, objects, applet, iframe, embed... but not cookies! Why is that?
FEEDBRO needs a simple option to load articles as text-only, or a simple option for blocking cookies. This will improve resources, and will solve privacy and security risks.

* Cookie add-ons are not working over cookies of other add-ons. Cookie AutoDelete doesn't work on FEEDBRO. I tested other different cookie addon-s and all of them don't recognize FEEDBRO as a "tab" or "window". The best scenario with these cookie add-ons is deleting cookies when FF closes, but dangerous FEEDBRO cookies might live hours and days. UMatrix is the only add-on deleting localstorage before FF closes, but is ridiculous to install 2MiB only because of FEEDBRO.

* I have more than 200 feeds, so is impossible to white-list cookies. Also, FF built-in cookies manager doesn't allow to import/export or synchronized blocked/unblocked cookies. No one is going to expend days doing this inefficient task.

** I am raising my stars qualification considering author' predisposition to: a) Solve problems b) Attend user requests c) Quick answers. Thank you.

** 2MiB is not a matter of size in the HD, but it is a huge matter of browser system resources. And in principle, isn't right to force the use of other add-ons in order to use FEEDBRO.
FEEDBRO perfectly can work without cookies. And not approved cookies are a big privacy and security issue. So, a simple option loading articles as text-only is the perfect solution. Thank you.

Looks like a good replacement for Sage, however Id' also suggest a compact, no-frills "two-column, left one split into upper and lower half" layout: https://imgur.com/a/dslQ8

The current "Layout 3" comes closest to this, but it wastes way too much space.

Thanks!

Trying Feedbro while Brief updates to work on FF57
There's a lot of small issues here and there: lack of support for Live bookmarks (which Firefox has been using for some years now), UI unpredictability and general weirdness (Not only can't I set an exact number of minutes for scan interval, you chose to represent a year as 525600 minutes!), can't drag'n'drop links for fast feed creation, can't select multiple feeds... Mostly minor UI stuff that builds up and makes the add-on annoying to deal with, but It seems likely that they'll get fixed over time.

What really stands out is the rules system. I've got a feed that's always giving me trouble, both here and back on Brief, where marking the "don't mark updated articles as unread" checkbox solved it's hijinks, but since Feedbro lacks that I tried to solve it with rules. The hijinks this time is that every time the scan interval completes, a single, old article reappears as brand new, and my gut feeling was to use the rules to compare if the time at which it was detected was more recent than the earliest article. Sadly, you can't compare articles, nor check any kind of time atribute. So as a emporary measure I've placed a rule to mark all updates from said feed as read, and not notify me of said updates. Bummer.
Then there's another feed that usually posts multiple articles at once, to be read in a particular order. Since notifications are per article, when the update hits I get spammed with notifications, and was about to set a rule to check wetherarticles have been posted within seconds of each other, only to remember I can't check that. Bummer again.
Those are just two specific cases, what Im really trying to get at is that the rules system has the potential to become an incredibly powerful tool.

TL;DR: Feedbro really shows potential to become great, but right now it's just fine and usable. Won't be using it yet, but will definitely come back to check again in a few months to see what's changed.

I think it is actually pretty good for being a new reader and being built on the toy APIs of chrome/nufirefox. It is probably the only feed reader compatible with FF57+, and has some smart ideas, like the rule system.

My 2 cents on what to improve next:

* Improve feed compatibility (4 of my feeds that work on newsfox give an error on this one).
* Make pane resize area bigger than 1px, since right now is a PITA to resize any of the areas.
* Feed refresh cannot be disabled and be set to manual. Some users only need to refresh when they are going to read the news, and don't appreciate having stuff running on the background all the time.
* It would be nice to have a traditional 3-pane mode like the one on rssowl or newsfox, specially with the function to autoscroll every time the last item is selected, so the user does not need to move the mouse all the time to select the next item.
* Allow to rebind the hotkeys, or at least allowing to use the keyboard cursors to select the next article.

Hope you find these suggestions useful.