Finally, I have found this addon for Firefox! I had a feeling there wouldn’t even be one since what I was asking for seemed so mundane. Well, I was proved wrong. I simply wanted an addon that allowed me to easily close a tab/page within Firefox with my mouse. I was tired of having to move my mouse over every tab first before I could close it. While I am using a very basic mouse with a wheel button, I didn’t want to download and install any third-party utilities on my laptop just for configuring the button settings. Even if I would have done so, I would have programmed the wheel button click to close the tab. However, we all know that sometimes we press that middle button by mistake so that wouldn’t have worked anyways. After some time with Google, I have stumbled across the Rights to Close (RtC) addon. This addon does one thing and one thing only and that is allowing you to close a tab in Firefox by simply double-clicking your right mouse button. Best part is that this works from almost anywhere within the page!
Within RtC’s option menu, you won’t find a lot of preferences to configure. In fact, you’re only allowed to configure one thing and that is to tell RtC what to do when you close the last tab (using RtC of course) in Firefox. You can either replace the last tab with a blank page or close the browser altogether.

If you want to do even more with your mouse within Firefox, then you must look at using mouse gestures to do your bidding. Mouse gestures allow you to move your mouse a certain way to perform certain tasks within Firefox. One addon that allows this is FireGestures (only one I can find at the moment that supports Firefox 4.0).

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yeah , select and google it feature is pretty useful in chrome . i also open and close lot of tabs for same reason but adding a new addon is not required for me
Thanks for sharing with us
initially i didnt got what you wanted , looks like you open and close lot of tabs
I actually do! Not only that but this simple addon is a big productivity booster for me. I set Google search to open every click via a new tab. Whenever I am done with one tab, I simple use Rights To Close and I’m back at my Google search results ready to visit another new website. It’s a huge time saver for me as I don’t have to hit the Back button numerous times or hover my mouse over the tab first before being able to close it.