After jumping down a few rabbit holes, finally found a browser for those of us who stubbornly cling to Windows XP as a back-up desk/laptop solution (167 million via StatCounter to 254 million using Net Applications, 2015 numbers}.
As mentioned, latest version of Firefox works, but it's slooooow on iHump (more later).
Anyway, if you're using WinXP, you may want to try Comodo IceDragon 40.1.1.18, but not newer versions: filehorse com. Based on Firefox, but slimmer, faster.
Good advice from a reviewer: First thing you have to do is block automatic updates .... Tools/Options/Advanced/Update/Never check for updates. If you don't block it, the program will download the latest version of the browser, which is not compatible with Windows XP, and it will crash.
Ad Blocker Ultimate further speeds up the party.
Good advice from Meat: "I don't care either way about 3rd party cookies. You do need to keep cookies from advfn.com and investorshub.advfn.com. Keep them until they expire rather than clearing them when you shut down Firefox."
If there are any other browser ideas, pls yell.