I know some readers still maintain older PCs, so they may be interested in r3dfox. A maintained fork of the latest Firefox browser for Windows 7, and now out of beta. Can work as far back as Windows Vista in 32-bit, apparently. Also “limited compatibility for XP using OCAPI”. I still have on an ancient rarely-used ‘backup’ Asus Eee mini-laptop from the mid 2000s. Maybe I’ll try it on that, though I should really scrub it and put Linux on it.
Your alternative here would be the worthy Pale Moon Firefox fork, which also works on Windows 7. For the latest Chrome browser on Windows 7, see the new Supermium browser.