Install opera browser it has back/forward buttons etc. and its easy to use, u can also use back button next to home button to go back. Juice defender should help u to save battery but I havent tried it so dunno if it rly saves battery and abou the Roms there are many threads about them in androidforums. Rom Manager bricks your phone(I was one of its victims)because its incompatible with Ace but u need to root ur device to use it.

 

Welcome to android forums Darfyddi,

You can use the back button of the phone to go back a page on the browser, there usually is a forward button on the browser, i don't remember if the default browser has it or not. There are many other browsers available on the play store like opera, dolphin etc, you can try them ans see which suits your needs best.

ROM MANAGER is an application, its used only by rooted android users, its quite popular with a lot of android devices, however its fatal for the ACE, literally destroys its motherboard, so its there in the stickies as a warning for ACE users but unfortunately people still use it and destroy their phones. Its not something you need to concern yourself with, unless you plan to root your phone.

Rooted users use custom softwares(roms) on their phones,so its written in the threads that the default software that you have right now gives the best battery life compared to all other custom roms.

When you use 'back' button to exit any app, it does not always shuts down the app, sometimes the apps keep running in the background, so people use task killer apps to close such applications, because these apps consume battery and ram while running in the background. However the android's system is designed such a way that these task killers are actually harmful to the system, the software manages these apps by itself and shuts them down after a certain background run time. So its suggested not to use task killers.

Juice defender has good reviews but with all the confusing configurations in it, its quite a tiresome thing to setup initially, and all it does is close wifi/bluetooth/gps etc when not in use, you can do these yourself too, there is nothing this app does that you can't do yourself.
To save battery, close wifi/bluetooth/2g and 3g/gps etc when not required, they consume a lot of battery. Also keep the display brightness level to a minimum level suitable for your eyes, brightness takes battery too. Keep unnecessary vibrations/sounds/apps off and you can easily go through a day on moderate usage without recharging.

Have a good android experience, if you have any more questions, feel free to ask but just search a bit first because most of the common questions are already answered in these forums and it becomes a bit tiresome to answer same questions repeatedly.
But if you still have questions, don't hesitate and do ask us.