You should use Firefox 33.1 (the latest version). Please note that the amount of RAM you have for that computer isn't even enough to run Windows XP properly, you should have at least 256mb of RAM. Try contacting a reputable local computer shop, it should be an inexpensive upgrade. If this is your first time running Firefox, let's do a few things to make sure your computer is up and running as good as possible: * Update Windows: windows.microsoft.com/windows/windows-update this helps bring the latest performance improvements, security fixes and keeps your computer running stable. Make sure you have Service pack 3 and all other updates installed. * Scan for malware. Windows XP is no longer support by microsoft, which makes it very vulnerable to attack. [[Troubleshoot Firefox issues caused by malware]] run all the programs in that article and remove any threats they find * Update your graphics driver: [[Upgrade your graphics drivers to use hardware acceleration and WebGL]] this will help keep Firefox and your computer running as fast as possible. * After doing all this, [[How to download and install Firefox on Windows]] and read [[Get started with Firefox - An overview of the main features]] And remember, get more RAM ;)

[[Firefox no longer works with some versions of Windows XP]] You need at least Windows XP Service Pack 2 for current Firefox versions. Firefox 3.6.28 and Firefox 12 are the last versions of Firefox that will work with the original version of Windows XP and Windows XP Service Pack 1. Update Windows: *http://windows.microsoft.com/en-us/windows/windows-update