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diff -up firefox-91.0.1/build/moz.configure/nspr.configure.nss-nspr-downgrade firefox-91.0.1/build/moz.configure/nspr.configure
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--- firefox-91.0.1/build/moz.configure/nspr.configure.nss-nspr-downgrade	2021-08-25 13:17:26.265307060 +0200
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+++ firefox-91.0.1/build/moz.configure/nspr.configure	2021-08-25 13:17:28.161313632 +0200
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@@ -50,7 +50,7 @@ set_define("JS_WITHOUT_NSPR", True, when
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 def nspr_minver(js_standalone):
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     if js_standalone:
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         return "nspr >= 4.10"
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-    return "nspr >= 4.32"
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+    return "nspr >= 4.31"
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 nspr_pkg = pkg_check_modules("NSPR", nspr_minver, when="--with-system-nspr")
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diff -up firefox-91.0.1/build/moz.configure/nss.configure.nss-nspr-downgrade firefox-91.0.1/build/moz.configure/nss.configure
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--- firefox-91.0.1/build/moz.configure/nss.configure.nss-nspr-downgrade	2021-08-25 13:17:45.049372175 +0200
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+++ firefox-91.0.1/build/moz.configure/nss.configure	2021-08-25 13:17:37.763346918 +0200
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@@ -9,7 +9,7 @@ option("--with-system-nss", help="Use sy
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 imply_option("--with-system-nspr", True, when="--with-system-nss")
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 nss_pkg = pkg_check_modules(
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-    "NSS", "nss >= 3.68", when="--with-system-nss", config=False
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+    "NSS", "nss >= 3.67", when="--with-system-nss", config=False
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 )
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 set_config("MOZ_SYSTEM_NSS", True, when="--with-system-nss")