i am not able to download for
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Sorry but the Samsung S5830 Galaxy Ace has a older ARMv6 type of cpu when a ARMv7 is needed. https://wiki.mozilla.org/Mobile/Platforms/Android#System_Requirements
The good news is that Mozilla is looking to try and get ARMv6 Firefox releases in future.
There are third-party ARMv6 builds of mobile Firefox that you can try at your own risk at http://forum.xda-developers.com/showthread.php?p=25855563