Several features are free: Unlimited sources and feeds, entire search for your own feeds, unlimited tags, sharing via inoreader email
There is also: loading of mobilized content via single click/key, better shortcuts, comprehensive tagging management, more settings, better settings placement, contact management, better feeds stats info, save an entry as pdf or print it, more sharing options, better compact theme, more RSS export settings, export the entire profile which includes the content for favorites and save web pages
Free Feedly boards are limited to 3 and have been only introduced last year, while tags in Inoreader are more powerful, free and part of the service since 2013
You can optionally toggle the browser.tabs.loadDivertedInBackground value in about:config to true, then the v shortcut will open in background.
That said, I find the add-on a must-have. I'm always using it to save web pages. Do not forget to check the HTTPS option in setting, though.
As a reference [1]:
browser.tabs.loadInBackground => when you open a regular link in a new tab using Ctrl+click (or right-click > Open in a New Tab) default = true, do not make the new tab active In the Options dialog/page, this is controlled by the "When I open a link in a new tab, switch to it immediately" setting.
browser.tabs.loadDivertedInBackground => when you divert a script-generated new window to a new tab using Ctrl+click, or when a page uses the target attribute to launch a link in a new window and you divert it to a new tab default = false, make the new tab active
browser.tabs.loadBookmarksInBackground => when you load a bookmark in a new tab using Ctrl+click (or right-click > Open in a New Tab) default = false, make the new tab active
This was years ago, and back there was already a feature request on Feedly's website asking for this to be fixed. I just took a look at that request it looks exactly the same, so either they haven't done anything about this (most likely) or they fixed it but forgot to close the issue.