i wish to gain more view space by doing that...as it is done in chrome !

When you say "titlebar," which toolbar specifically do you mean?

You can position the mouse over the toolbars at the top of the screen, right-click, and remove everything except the menu bar and the titlebar that is created by the desktop environment/window manager.

I can find no way to remove the menu bar or the titlebar imposed by the window manager/desktop environment (this is using Debian's rebranded Firefox, Iceweasel v. 3.5.x).

we can remove menu bar...containing view edit help etc.
I wish to remove title bar...top most bar where name of page you are viewing is written with mozilla firefox written too !

try hitting F11 with Firefox as the active window (in KDE, maybe other desktop managers as well)

Oxygen KDE (Firefox Theme) KDE-Look.org - http://kde-look.org/content/show.php/?content=117962
How to hide the title bar of Firefox in KDE

1. Open System Settings
2. Go to Workspace appearance --> Configure Decoration --> Window-Specific Ovverrides
3. Look for Exceptions related to Firefox and edit it ... If there isn't create it using these values :

-To hide the title bar of all windows related to Firefox

Matching window property : Window Class Name
Regular expression to match : Firefox

-To hide only the title bar of the main window of firefox (recommended)

Matching window property : Window Title
Regular expression to match : Mozilla Firefox

4. Check "Hide window title bar"
5. Now the Firefox title bar will be hidden . Now you may need the buttons min.max,close or drag to control the window. Customize the toolbars in Firefox and you'll find these new toolbar buttons.

Devilspie with the following configuration (.devilspie/iceweasel.ds under my home folder) works great

(if
(and
(is (application_name) "Iceweasel")
(is (window_role) "browser")
)
(undecorate)
)

To me Firefox is Iceweasel since I run Debian. I guess it must be "firefox" or something similar in other linux distros.

You can get rid of the menubar very easily.

View-> Toolbars-> Menu Bar. Untick, its gone.

To remove the titlebar, you can use one of a few firefox addons. Or you can try this for KDE users (I know your one dEnDrOn)

Rigth click on the Titlebar-> Advanced-> Special applicatin settings-> Appearance and fixes (tab)-> No titlebar and frame.

*edit- theres a few firefox addons that should remove the Titlebar as well.

The Easiest way i found while using iceweasal/firefox just like chrome was by pressing F11(Reading mode) and disable Autohide by clicking right click on bar(Tab bar).
You will be able to see most of the content.

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