UPDATE 2: New add-on available to automatically transform Mozilla Firefox into IE9. Visit this link to learn more about it.
UPDATE 1: You can also have tabs and addressbar in same row using this tutorial.
If you are using Mozilla Firefox 4.0 or above and want to make it look-like Internet Explorer 9, this tutorial will help you.
We'll need following 4 add-ons to complete our task:
Here are the step-by-step instructions:
1. First install Stratiform extension. Make sure to install version 1.1 as the later versions don't come with IE9 option. (Thanks rcmero for pointing it out.)
Once installed, open its Settings and change all resources to IE9 like toolbar buttons, icons, text fields, tabs, etc.

2. Now install App Button Remove and it'll remove orange Firefox button.
3. At last, install Omnibar which will combine Addressbar and searchbox. To remove search engine name from combined box, right-click on toolbar and deselect "Show Omnibar in Urlbar" option.

4. If you want to have the domain highlighting feature as well, you can use Locationbar² add-on. Thanks to our reader "Karrypto" for reminding us...
That's it. After following above steps, the final look will be as following:

Doesn't it look like IE9? Please post your opinions...
Thanks to our reader "AB_Samuel" for this idea...
This article was posted by VG in following section: Mozilla Firefox.
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Anonymous
There's no Tools menu, so browsing becomes extremely hard.
Drater
@Anon, tru pressint ALT retard.
Karrypto
It does look like IE, but there's one little flaw. The tabs and the adress bar are in the same "line", but if you just drag the address bar down, it is too big and there's no way to resize it, as far as I can tell.
Drater
Also, the whole point of ie9 is the tabs on the side of the bar.
Karrypto
sry for double post, but you can also make it more like IE by using an addon called "Locationbar²", which only greys out the main address(e.g. only aksvg.com, not ask.com/make-your...) like in IE.
Fauzie
@Drater,
In IE9 you can also make the tabs show on a separate row.
http://www.askvg.com/how-to-show-tab-bar-on-a-separate-row-in-microsoft-internet-explorer-9-ie9-rc-release-candidate/
Uewd
Thank you!
leomate
Cool.
BTW, i got if Microsoft lazy to update GUI resources in update.microsoft.com/microsoftupdate/v6/vistadefault.aspx?ln=en-us
Picture taken in windows 7 beta.
FrancisForward
Thanks for the hint, but doesn#t work for FF (Aurora) 5.0a2 :P
SMBR
Tnx Alot!!!!!!!!!!!