diff --git a/javascript/builtins/Temporal/PlainDate.json b/javascript/builtins/Temporal/PlainDate.json
index 847ca4a6d95b5c..b402149984f117 100644
--- a/javascript/builtins/Temporal/PlainDate.json
+++ b/javascript/builtins/Temporal/PlainDate.json
@@ -1690,7 +1690,9 @@
                 },
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": "139"
+                  "version_added": "139",
+                  "partial_implementation": true,
+                  "notes": "Calendars `islamic`, `islamic-rgsa` and `islamic-umalqura` are not available. See [bug 1950425](https://bugzil.la/1950425) and [bug 1954138](https://bugzil.la/1954138)."
                 },
                 "firefox_android": "mirror",
                 "ie": {
diff --git a/javascript/builtins/Temporal/PlainDateTime.json b/javascript/builtins/Temporal/PlainDateTime.json
index f650e6865cf4e4..46ac161bb39154 100644
--- a/javascript/builtins/Temporal/PlainDateTime.json
+++ b/javascript/builtins/Temporal/PlainDateTime.json
@@ -2002,7 +2002,9 @@
                 },
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": "139"
+                  "version_added": "139",
+                  "partial_implementation": true,
+                  "notes": "Calendars `islamic`, `islamic-rgsa` and `islamic-umalqura` are not available. See [bug 1950425](https://bugzil.la/1950425) and [bug 1954138](https://bugzil.la/1954138)."
                 },
                 "firefox_android": "mirror",
                 "ie": {
diff --git a/javascript/builtins/Temporal/ZonedDateTime.json b/javascript/builtins/Temporal/ZonedDateTime.json
index eb4b169a1a051a..5a64c86a7d7ee8 100644
--- a/javascript/builtins/Temporal/ZonedDateTime.json
+++ b/javascript/builtins/Temporal/ZonedDateTime.json
@@ -2470,7 +2470,9 @@
                 },
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": "139"
+                  "version_added": "139",
+                  "partial_implementation": true,
+                  "notes": "Calendars `islamic`, `islamic-rgsa` and `islamic-umalqura` are not available. See [bug 1950425](https://bugzil.la/1950425) and [bug 1954138](https://bugzil.la/1954138)."
                 },
                 "firefox_android": "mirror",
                 "ie": {