diff -Nuar firefox-95.0.orig/build/mach_initialize.py firefox-95.0/build/mach_initialize.py
--- firefox-95.0.orig/build/mach_initialize.py	2021-11-29 17:08:48.000000000 +0100
+++ firefox-95.0/build/mach_initialize.py	2021-12-12 17:38:59.097765203 +0100
@@ -219,7 +219,7 @@
         assert (
             not requirements.pypi_requirements
         ), "Mach pip package requirements must be optional."
-        if has_pip:
+        if False:
             pip = [sys.executable, "-m", "pip"]
             check_result = subprocess.run(
                 pip + ["check"],