Well we already knew that you are not a Firefox lover, but that post offers further proof. As mentioned in post #4, MyPal is no longer being developed. Serpent 52 from roytam1 is essentially a portable build of Basilisk from Moonchild Productions with added support for XP/Vista. Like Pale Moon 28 and 29, Basilisk is based on Moonchild’s UXP Platform, which in turn is based on Firefox
52. (The other Serpent build is a long story.)
Since virtually no one here is actually interested in browsers
For Vista Extended Kernel, I should point out that MSFN has a subforum
Browsers working on Older NT-Family OSes with various threads about Extreme Explorer 360, roytam1’s browser builds, etc.