Rated 4 out of 5 stars
It's a good reader overall. However, I have problems with it when Firefox is synchronizing accross more computers. I have installed Brief addon in Firefox on a computer, I have set up the feeds and everything worked well. I could see the Subscribed Feeds folder in the Bookmarks manager and I could access the live bookmarks there. This Firefox instance is set up to synchronize the bookmarks using the Mozilla cloud. Then, I have installed Brief addon in Firefox on another computer. This Firefox instance is set up to synchronize the bookmarks using the Mozilla cloud as well. This time, the addon has created another folder Subscribed Feeds and there's no feed inside. Now, the Bookmarks manager displays two folders with the same name, Subscribed Feeds: one contains the live bookmarks that I have set up on the first computer and one is empty. I have looked for an option to tell Brief the bookmark folder to use for the live bookmarks, but I haven't found one.
Another problem that I have with Brief is that I haven't found a way to display the articles on 3 columns, but I'm more interested to solve the first problem.
I am using Firefox 53.0.2 for Windows x64
1. This is a known problem. It will be fixed in the future, but not right now due to the ways this feature interacts with the WebExtensions migration coming. For the current workarounds, see https://github.com/ancestorak/brief/wiki/FAQ#brief-does-not-use-the-feeds-folder-synced-from-firefox-sync
2. There's no explicit support for that... it may be possible by using CSS, or may be not possible, not sure.