diff --git a/Userland/Libraries/LibCore/Resource.cpp b/Userland/Libraries/LibCore/Resource.cpp
index f196828f433..4334b893f5b 100644
--- a/Userland/Libraries/LibCore/Resource.cpp
+++ b/Userland/Libraries/LibCore/Resource.cpp
@@ -11,24 +11,27 @@
 
 namespace Core {
 
-Resource::Resource(String path, Scheme scheme, NonnullOwnPtr<Core::MappedFile> file)
+Resource::Resource(String path, Scheme scheme, NonnullOwnPtr<Core::MappedFile> file, time_t modified_time)
     : m_path(move(path))
     , m_scheme(scheme)
     , m_data(move(file))
+    , m_modified_time(modified_time)
 {
 }
 
-Resource::Resource(String path, Scheme scheme, ByteBuffer buffer)
+Resource::Resource(String path, Scheme scheme, ByteBuffer buffer, time_t modified_time)
     : m_path(move(path))
     , m_scheme(scheme)
     , m_data(move(buffer))
+    , m_modified_time(modified_time)
 {
 }
 
-Resource::Resource(String path, Scheme scheme, DirectoryTag)
+Resource::Resource(String path, Scheme scheme, DirectoryTag, time_t modified_time)
     : m_path(move(path))
     , m_scheme(scheme)
     , m_data(DirectoryTag {})
+    , m_modified_time(modified_time)
 {
 }
 
@@ -66,6 +69,11 @@ String Resource::file_url() const
     return MUST(String::formatted("file://{}", filesystem_path()));
 }
 
+Optional<time_t> Resource::modified_time() const
+{
+    return m_modified_time;
+}
+
 String Resource::filename() const
 {
     return MUST(String::from_utf8(LexicalPath(m_path.bytes_as_string_view()).basename()));
diff --git a/Userland/Libraries/LibCore/Resource.h b/Userland/Libraries/LibCore/Resource.h
index c79def4a4fa..5be17e6647d 100644
--- a/Userland/Libraries/LibCore/Resource.h
+++ b/Userland/Libraries/LibCore/Resource.h
@@ -31,6 +31,7 @@ public:
     [[nodiscard]] String filename() const;
     [[nodiscard]] String filesystem_path() const;
     [[nodiscard]] String file_url() const;
+    [[nodiscard]] Optional<time_t> modified_time() const;
 
     [[nodiscard]] ByteBuffer clone_data() const;
     [[nodiscard]] ByteBuffer release_data() &&;
@@ -55,14 +56,15 @@ private:
         Resource,
     };
 
-    Resource(String path, Scheme, NonnullOwnPtr<Core::MappedFile>);
-    Resource(String path, Scheme, ByteBuffer);
-    Resource(String path, Scheme, DirectoryTag);
+    Resource(String path, Scheme, NonnullOwnPtr<Core::MappedFile>, time_t modified_time);
+    Resource(String path, Scheme, ByteBuffer, time_t modified_time);
+    Resource(String path, Scheme, DirectoryTag, time_t modified_time);
 
     String m_path; // Relative to scheme root. File: abspath, Resource: resource root
     Scheme m_scheme;
 
     Variant<DirectoryTag, NonnullOwnPtr<Core::MappedFile>, ByteBuffer> m_data;
+    time_t m_modified_time {};
 };
 
 template<IteratorFunction<Resource const&> Callback>
diff --git a/Userland/Libraries/LibCore/ResourceImplementation.cpp b/Userland/Libraries/LibCore/ResourceImplementation.cpp
index 347d91d5921..7917adcc941 100644
--- a/Userland/Libraries/LibCore/ResourceImplementation.cpp
+++ b/Userland/Libraries/LibCore/ResourceImplementation.cpp
@@ -25,19 +25,19 @@ ResourceImplementation& ResourceImplementation::the()
     return *s_the;
 }
 
-NonnullRefPtr<Resource> ResourceImplementation::make_resource(String full_path, NonnullOwnPtr<Core::MappedFile> file)
+NonnullRefPtr<Resource> ResourceImplementation::make_resource(String full_path, NonnullOwnPtr<Core::MappedFile> file, time_t modified_time)
 {
-    return adopt_ref(*new Resource(move(full_path), Resource::Scheme::Resource, move(file)));
+    return adopt_ref(*new Resource(move(full_path), Resource::Scheme::Resource, move(file), modified_time));
 }
 
-NonnullRefPtr<Resource> ResourceImplementation::make_resource(String full_path, ByteBuffer buffer)
+NonnullRefPtr<Resource> ResourceImplementation::make_resource(String full_path, ByteBuffer buffer, time_t modified_time)
 {
-    return adopt_ref(*new Resource(move(full_path), Resource::Scheme::Resource, move(buffer)));
+    return adopt_ref(*new Resource(move(full_path), Resource::Scheme::Resource, move(buffer), modified_time));
 }
 
-NonnullRefPtr<Resource> ResourceImplementation::make_directory_resource(String full_path)
+NonnullRefPtr<Resource> ResourceImplementation::make_directory_resource(String full_path, time_t modified_time)
 {
-    return adopt_ref(*new Resource(move(full_path), Resource::Scheme::Resource, Resource::DirectoryTag {}));
+    return adopt_ref(*new Resource(move(full_path), Resource::Scheme::Resource, Resource::DirectoryTag {}, modified_time));
 }
 
 ErrorOr<NonnullRefPtr<Resource>> ResourceImplementation::load_from_uri(StringView uri)
@@ -51,10 +51,11 @@ ErrorOr<NonnullRefPtr<Resource>> ResourceImplementation::load_from_uri(StringVie
     if (uri.starts_with(file_scheme)) {
         auto path = uri.substring_view(file_scheme.length());
         auto utf8_path = TRY(String::from_utf8(path));
-        if (is_directory(path))
-            return adopt_ref(*new Resource(utf8_path, Resource::Scheme::File, Resource::DirectoryTag {}));
+        auto st = TRY(System::stat(utf8_path));
+        if (S_ISDIR(st.st_mode))
+            return adopt_ref(*new Resource(utf8_path, Resource::Scheme::File, Resource::DirectoryTag {}, st.st_mtime));
         auto mapped_file = TRY(MappedFile::map(path));
-        return adopt_ref(*new Resource(utf8_path, Resource::Scheme::File, move(mapped_file)));
+        return adopt_ref(*new Resource(utf8_path, Resource::Scheme::File, move(mapped_file), st.st_mtime));
     }
 
     dbgln("ResourceImplementation: Unknown scheme for {}", uri);
@@ -89,14 +90,4 @@ String ResourceImplementation::filesystem_path(Resource const& resource)
     return resource.m_path;
 }
 
-// Note: This is a copy of the impl in LibFilesystem, but we can't link that to LibCore
-bool ResourceImplementation::is_directory(StringView filesystem_path)
-{
-    auto st_or_error = System::stat(filesystem_path);
-    if (st_or_error.is_error())
-        return false;
-    auto st = st_or_error.release_value();
-    return S_ISDIR(st.st_mode);
-}
-
 }
diff --git a/Userland/Libraries/LibCore/ResourceImplementation.h b/Userland/Libraries/LibCore/ResourceImplementation.h
index 308b5edcaab..e173720a4ff 100644
--- a/Userland/Libraries/LibCore/ResourceImplementation.h
+++ b/Userland/Libraries/LibCore/ResourceImplementation.h
@@ -28,11 +28,9 @@ protected:
     virtual Vector<String> child_names_for_resource_scheme(Resource const&) = 0;
     virtual String filesystem_path_for_resource_scheme(String const&) = 0;
 
-    static bool is_directory(StringView filesystem_path);
-
-    static NonnullRefPtr<Resource> make_resource(String full_path, NonnullOwnPtr<Core::MappedFile>);
-    static NonnullRefPtr<Resource> make_resource(String full_path, ByteBuffer);
-    static NonnullRefPtr<Resource> make_directory_resource(String full_path);
+    static NonnullRefPtr<Resource> make_resource(String full_path, NonnullOwnPtr<Core::MappedFile>, time_t modified_time);
+    static NonnullRefPtr<Resource> make_resource(String full_path, ByteBuffer, time_t modified_time);
+    static NonnullRefPtr<Resource> make_directory_resource(String full_path, time_t modified_time);
 };
 
 }
diff --git a/Userland/Libraries/LibCore/ResourceImplementationFile.cpp b/Userland/Libraries/LibCore/ResourceImplementationFile.cpp
index 566b83e3edb..4ee4bcc2cf6 100644
--- a/Userland/Libraries/LibCore/ResourceImplementationFile.cpp
+++ b/Userland/Libraries/LibCore/ResourceImplementationFile.cpp
@@ -9,6 +9,7 @@
 #include <LibCore/DirIterator.h>
 #include <LibCore/Resource.h>
 #include <LibCore/ResourceImplementationFile.h>
+#include <LibCore/System.h>
 
 namespace Core {
 
@@ -25,10 +26,13 @@ ErrorOr<NonnullRefPtr<Resource>> ResourceImplementationFile::load_from_resource_
 
     auto path = TRY(String::from_utf8(uri.substring_view(resource_scheme.length())));
     auto full_path = TRY(String::from_byte_string(LexicalPath::join(m_base_directory, path).string()));
-    if (is_directory(full_path))
-        return make_directory_resource(move(path));
 
-    return make_resource(path, TRY(MappedFile::map(full_path)));
+    auto st = TRY(System::stat(full_path));
+
+    if (S_ISDIR(st.st_mode))
+        return make_directory_resource(move(path), st.st_mtime);
+
+    return make_resource(path, TRY(MappedFile::map(full_path)), st.st_mtime);
 }
 
 Vector<String> ResourceImplementationFile::child_names_for_resource_scheme(Resource const& resource)