I've just done what you suggested but I'm running an older version of firefox:52.9.0 ESR (x86 en-GB) so it does not work!!!! PLEASE HELP ME, PLEASE!!!!!
I have an old notebook:
Microsoft Windows XP 2002,intel pentium M processor,1600MHz,
1.60GHz,760 MB RAM
I don't feel right responding without saying this, so even though you might have heard it before:
Using Windows XP and firefox 52 is in my humble estimation crazy. You're asking for viruses. I'd strongly recommend installing linux on your machine and using that instead.
Linux Mint Xfce 32 bit might manage to run on your system, but your pushing up against the minimum requirements for doing so. If it does run well enough it is IMHO the easiest distro for a new user to use.
If you find it doesn't, Debian with (again) xfce should run just fine. Debian isn't exactly scary to install, but it's scarier than mint for a new user.
I can't promise full support, but if you need a pointer in the right direction while installing linux, feel free to email me at morenzg@google's mail service here.com (since I'm unlikely to see any replies here).
