Seamonkey is a browser developed and actively supported by its community. It still wears the old interface, sometimes you don’t need too many changes to the interface of the software you use most.

Firefox mutated from a slow moving development to very rapid release schedule and significantly changed its look, those remembering how Firefox was before version 4 will understand this.

The good thing about Firefox is they removed the clutter by removing/hiding menu bar, status bar, bookmark bar.

Seamonkey did not change at all, however, it does provide options to have more screen estate and the difference is significant.

Ok, Compare this with

Seamonkey with its default UI settings.

Seamonkey with its default UI settings.

this..

Seamonkey after the UI tweaks

Seamonkey after the UI tweaks

See the difference?

The following pictures go about how to achieve this.

First, remove the bars that you don’t need.

How to hide the status bar or any other bar that you don't want.

How to hide the status bar or any other bar that you don’t want.

Then change the icon size, disable text on the icons.

To do this you need to open customize prompt.

How to open toolbar customizing settings

How to open toolbar customizing settings

And disable text, select “Use Small Icons”

Minimize area used by your icons on toolbar

Minimize area used by your icons on toolbar

You can collapse the bars that you don’t require than removing them, by clicking on the handlers on the extreme left.

You can collapse toolbars that you don't want

You can collapse toolbars that you don’t want

With all these options Seamonkey can definitely be used as a browser with more screen area for the webpage. Hope this helps someone.

These screenshots were taken on a PC running FreeBSD 10.1 with XFCE 4.12.