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Not working in Firefox 37 and 38.
Not necessary any more, since Firefox will reintroduce the "Open all in tabs" option from version 42: https://bugzilla.mozilla.org/show_bug.cgi?id=730829
P.S.: This addon was great while it worked!
I do know how the add-on is supposed to work, but it still acts the way I said it does. If you want more details or screenshots, send an e-mail to my GMail account. I don't know how to reply to you without rating the add-on again.
I found the problem. There is a setting in Firefox, that I didn't even know about. If you go to Tools>Options>Applications>Web Feed then the default option for me was "Preview in Firefox". Your setting must be "Add Live Bookmarks in Firefox". That will cause a prompt.
Got to check if there is a workaround.
Une excellente nouvelle extension qui complète et facilite la lecture des marque-pages dynamiques, félicitations.