Unecessary Rated 2 out of 5 stars

Most of this functionality already exists in Firefox if you bothered to RTFM.

shift-click on a tab closes it - Shift + middle click already does this
move the address bar underneath the tab bar - Don't get that one since we already have tabs on top option
move the bookmarks toolbar above the tab bar - Already is for me if I have tabs on top disabled
add “open link in background tab” to open link context menu - Open link in New Tab already opens in a background tab
shift-ctrl-click open links in background tab - Just middle click the link
shift-click opens link in new focused tab - Shift + middle click on a link does this

This review is for a previous version of the add-on (0.9.1-signed.1-signed). 

you're completely right :-)

This extension is NOT meant as something that adds many revolutionary features to Firefox. It's just an attempt to reproduce the interface of Opera, that i've used for so many years and have come accustomed to.

This extension helps me to exclusively use open source software in my daily life, without losing any of the functionality i knew from the (closed source) Opera browser.

I thought that there might be some other Opera addicts that might like it's functionality, so i submitted it here. That's all :)

Oh BTW: there's one thing i think this extension and Opera do better than all other browsers :) : the ability to CLOSE ALL TABS! It's just doesn't make sense to me to shut down a whole application when the last document is closed. Do you know any other application (word processor? e-mail client? graphics editor? ..?) that just shuts down when you decide to stop working on a specific document?!