Top tip for a Lion browser
I have a 2008 white MacBook as an emergency spare if my SO's 2009 MBP suddenly dies.
It dual-boots Xubuntu 20.04 and MacOS 10.7.
No, there are no mainstream browsers for Lion, although Opera supported it later than most. But there's a Firefox fork that works well:
I found it worked extremely well on every modern site I tried. Makes Lion pretty usable again, combined with an old version of iWork or LibreOffice.