diff --git a/css/properties/-moz-image-region.json b/css/properties/-moz-image-region.json
deleted file mode 100644
index ba2d805980d51b..00000000000000
--- a/css/properties/-moz-image-region.json
+++ /dev/null
@@ -1,38 +0,0 @@
-{
-  "css": {
-    "properties": {
-      "-moz-image-region": {
-        "__compat": {
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/clip",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": "mirror",
-            "edge": "mirror",
-            "firefox": {
-              "version_added": "1",
-              "version_removed": "112"
-            },
-            "firefox_android": "mirror",
-            "oculus": "mirror",
-            "opera": "mirror",
-            "opera_android": "mirror",
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": "mirror",
-            "samsunginternet_android": "mirror",
-            "webview_android": "mirror",
-            "webview_ios": "mirror"
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": false
-          }
-        }
-      }
-    }
-  }
-}
diff --git a/css/selectors/-moz-focus-inner.json b/css/selectors/-moz-focus-inner.json
deleted file mode 100644
index 52c242d492b432..00000000000000
--- a/css/selectors/-moz-focus-inner.json
+++ /dev/null
@@ -1,39 +0,0 @@
-{
-  "css": {
-    "selectors": {
-      "-moz-focus-inner": {
-        "__compat": {
-          "description": "`::-moz-focus-inner`",
-          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/::-moz-focus-inner",
-          "support": {
-            "chrome": {
-              "version_added": false
-            },
-            "chrome_android": "mirror",
-            "edge": "mirror",
-            "firefox": {
-              "version_added": "1",
-              "version_removed": "89"
-            },
-            "firefox_android": "mirror",
-            "oculus": "mirror",
-            "opera": "mirror",
-            "opera_android": "mirror",
-            "safari": {
-              "version_added": false
-            },
-            "safari_ios": "mirror",
-            "samsunginternet_android": "mirror",
-            "webview_android": "mirror",
-            "webview_ios": "mirror"
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": false,
-            "deprecated": true
-          }
-        }
-      }
-    }
-  }
-}