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The Python 3 changes support Python 3.6 and above. I'm not sure what version of mozilla-build you use, upstream we are using mozilla-build 3.4 which ships with Python 2.7 and Python 3.6. I don't know if it will install on Windows XP, but I know for sure it will install on Windows 7. Most of his "performance improvements" code outside of restoring e10s actually make the browser slower according to benchmarks. He did import some newer WebExtensions support so you might want to merge that.

New build of post-deprecated Serpent/moebius for XP! * Notice: This repo will not be built on regular schedule, and changes are experimental as usual. ** Current moebius patch level should be on par with 52.9, but some security patches can not be applied/ported due to source milestone differences between versions. Test binary: Win32 https://o.rthost.win/basilisk/basilisk55-win32-git-20260411-2f20f30db-xpmod.7z Win64 https://o.rthost.win/basilisk/basilisk55-win64-git-20260411-2f20f30db-xpmod.7z repo: https://github.com/roytam1/basilisk55 Repo changes: - import from UXP: Issue #3027 - modify nsGIOService to call libdbus directly instead of using dbus-glib (c97bc33a) (ad86e28ed) - import from UXP: Issue #3027 - remove all uses of dbus-glib from widget/ (6ce1b9a8) (39391a877) - import from UXP: Issue #3042 - Add canvas WebGL context `powerPreference` (546e0075) (2f20f30db)

New build of BOC/UXP for XP! Test binary: MailNews Win32 https://o.rthost.win/boc-uxp/mailnews.win32-20260411-40a79c75-uxp-c8f7030b13-xpmod.7z BNavigator Win32 https://o.rthost.win/boc-uxp/bnavigator.win32-20260411-40a79c75-uxp-c8f7030b13-xpmod.7z source repo (excluding UXP): https://github.com/roytam1/boc-uxp/tree/custom * Notice: the profile prefix (i.e. parent folder names) are also changed since 2020-08-15 build, you may rename their names before using new binaries when updating from builds before 2020-08-15. -- New build of HBL-UXP for XP! Test binary: IceDove-UXP(mail) https://o.rthost.win/hbl-uxp/icedove.win32-20260411-id-656ea98-uxp-c8f7030b13-xpmod.7z IceApe-UXP(suite) https://o.rthost.win/hbl-uxp/iceape.win32-20260411-id-656ea98-ia-c642e3c-uxp-c8f7030b13-xpmod.7z source repo (excluding UXP): https://github.com/roytam1/icedove-uxp/tree/winbuild https://github.com/roytam1/iceape-uxp/tree/winbuild

New build of Serpent/UXP for XP! Test binary: Win32 https://o.rthost.win/basilisk/basilisk52-g4.8.win32-git-20260411-3219d2d-uxp-c8f7030b13-xpmod.7z Win64 https://o.rthost.win/basilisk/basilisk52-g4.8.win64-git-20260411-3219d2d-uxp-c8f7030b13-xpmod.7z source code that is comparable to my current working tree is available here: https://github.com/roytam1/UXP/commits/custom IA32 Win32 https://o.rthost.win/basilisk/basilisk52-g4.8.win32-git-20260411-3219d2d-uxp-c8f7030b13-xpmod-ia32.7z source code that is comparable to my current working tree is available here: https://github.com/roytam1/UXP/commits/ia32 NM28XP build: Win32 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win32-git-20260411-d849524bd-uxp-c8f7030b13-xpmod.7z Win32 IA32 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win32-git-20260411-d849524bd-uxp-c8f7030b13-xpmod-ia32.7z Win32 SSE https://o.rthost.win/palemoon/palemoon-28.10.7a1.win32-git-20260411-d849524bd-uxp-c8f7030b13-xpmod-sse.7z Win64 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win64-git-20260411-d849524bd-uxp-c8f7030b13-xpmod.7z Win7+ x64 AVX2 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win64-git-20260411-d849524bd-uxp-c8f7030b13-w7plus-avx2.7z Official UXP changes picked since my last build: - Issue #3027 - modify nsGIOService to call libdbus directly instead of using dbus-glib (c97bc33a87) - Issue #3027 - remove all uses of dbus-glib from widget/ (6ce1b9a8c0) - Issue #3042 - Add canvas WebGL context `powerPreference` (546e0075dd) No official Pale-Moon changes picked since my last build. No official Basilisk changes picked since my last build. Update Notice: - You may delete file named icudt*.dat and icu63.dll inside program folder when updating from old releases. * Notice: From now on, UXP rev will point to `custom` branch of my UXP repo instead of MCP UXP repo, while "official UXP changes" shows only `tracking` branch changes.