So far this extension works well, though I have to mention that Firefox Sync only works through Dropbox which is a bit limiting. Setting that aside, I think it would be great if the reading list could include sorting and categorization features. This would make it much easier to keep saved articles organized and find them again later by browsing through specific categories

Blows the competition away. This is a really lovely looking app and the "add to read next" icon on the toolbar is really in-keeping with Firefox's own icons, and the reading list side-bar is nice and compact. Nice one!

Great extension! All that you need for reading list, besides one thing... It's great to have the sync though FF bookmarks. This will allow to sync reading list with FF on my phone.