hi ayrehead2, unfortunately if you're on a very old processor that doesn't support sse2 instructions 48.0.2 is the last version that runs on those machines - if your device with windows xp is compatible you would have been automatically updated to firefox 52esr already. Your hardware is no longer supported

ultimately you should look into replacing your setup - when stranded on an operating system and browser which no longer receive security updates you're putting all your data at risk when being connected to the internet.

Note that you can consider to use the Firefox 45.9.0 ESR version that is more recent and has more security fixes.

• https://download.mozilla.org/?product=firefox-45.9.0esr&os=win&lang=en-US

• https://www.mozilla.org/en-US/firefox/45.9.0/releasenotes/
• https://www.mozilla.org/en-US/firefox/45.9.0/system-requirements/

Suppose i migrate to ESR 45.9. Will security updates end after September 2017 for someone like me with XP and old processor? I read that but it was not certain.

Firefox 45.9.0 ESR is already outdated and is no longer maintained with updates, but is the best option if you have an older processor that doesn't support current releases.

I tried to download 45.9.0 ESR at the link given above: https://download.mozilla.org/?product=firefox-45.9.0esr&os=win&lang=en-US

But it redirects and gives me the file: Firefox Setup 52.2.1esr.exe

Where can i download 45.9.0 ESR?

I see there are other websites that offer it. Is there a trusted site? But is it available on mozilla.org?

Doesn't redirect for me, OP. In any case, here's an alternative link to 45.9.0esr for Windows 32-bit.

http://ftp.mozilla.org/pub/firefox/releases/45.9.0esr/win32/en-US/Firefox%20Setup%2045.9.0esr.exe

Thanks. Your link worked and took me to the promised land.