Open in background tab in Firefox

Does anyone know if it’s possible to get this Chrome extension in Firefox or some similar type of functionality.

I have tried Chrome Store Foxified but it didn’t seem to work on this extension.

Set browser.tabs.loadDivertedInBackground to true in about:config

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I did find that in the Goodies and Mobile Apps link but unless I’m doing something wrong this affects everything and not just Newsblur.