Windows XP remains one of the most beloved operating systems in computing history. Launched in 2001, its lightweight design and familiar interface ensured it stayed on millions of computers long after Microsoft ended official support in 2014. If you are reading this, you likely have an older machine—perhaps a nostalgic gaming rig, a secondary laptop, or an industrial computer—that still runs Windows XP perfectly fine.
Before downloading, understand why this specific browser ecosystem is your best choice:
You can find the installer on the Mozilla Archive. Select the Firefox Setup 52.9.0esr.exe file.
If you are technically savvy and require a browser that can actually render modern websites (like PayPal, banking sites, or streaming services) on Windows XP, you need to look beyond Mozilla.
You must use the 32-bit version , even if your Windows XP is 64-bit.