diff --git a/Core/FeatureFlag.swift b/Core/FeatureFlag.swift
index 8bf183dafd..7ec10ba680 100644
--- a/Core/FeatureFlag.swift
+++ b/Core/FeatureFlag.swift
@@ -32,6 +32,7 @@ public enum FeatureFlag: String {
     case autofillFailureReporting
     case autofillOnForExistingUsers
     case autofillUnknownUsernameCategorization
+    case autofillPartialFormSaves
     case incontextSignup
     case autoconsentOnByDefault
     case history
@@ -101,6 +102,8 @@ extension FeatureFlag: FeatureFlagDescribing {
             return .remoteReleasable(.subfeature(AutofillSubfeature.onForExistingUsers))
         case .autofillUnknownUsernameCategorization:
             return .remoteReleasable(.subfeature(AutofillSubfeature.unknownUsernameCategorization))
+        case .autofillPartialFormSaves:
+            return .remoteReleasable(.subfeature(AutofillSubfeature.partialFormSaves))
         case .incontextSignup:
             return .remoteReleasable(.feature(.incontextSignup))
         case .autoconsentOnByDefault:
diff --git a/Core/Pixel.swift b/Core/Pixel.swift
index 04f48ee03f..ded3c22a2c 100644
--- a/Core/Pixel.swift
+++ b/Core/Pixel.swift
@@ -147,6 +147,7 @@ public struct PixelParameters {
 
     // Autofill
     public static let countBucket = "count_bucket"
+    public static let backfilled = "backfilled"
 
     // Privacy Dashboard
     public static let daysSinceInstall = "daysSinceInstall"
diff --git a/DuckDuckGo.xcodeproj/project.pbxproj b/DuckDuckGo.xcodeproj/project.pbxproj
index 65b869efe7..b7569472d1 100644
--- a/DuckDuckGo.xcodeproj/project.pbxproj
+++ b/DuckDuckGo.xcodeproj/project.pbxproj
@@ -11168,7 +11168,7 @@
 			repositoryURL = "https://github.com/DuckDuckGo/BrowserServicesKit";
 			requirement = {
 				kind = exactVersion;
-				version = 218.1.0;
+				version = 219.0.0;
 			};
 		};
 		9F8FE9472BAE50E50071E372 /* XCRemoteSwiftPackageReference "lottie-spm" */ = {
diff --git a/DuckDuckGo.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved b/DuckDuckGo.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
index 3c92013c76..f2ec97c5fa 100644
--- a/DuckDuckGo.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
+++ b/DuckDuckGo.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
@@ -32,8 +32,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/DuckDuckGo/BrowserServicesKit",
       "state" : {
-        "revision" : "a82c14b991f8cbef46d4b7d8e613762f1592fcd2",
-        "version" : "218.1.0"
+        "revision" : "20df9e22d5a69acfc25204fb0228a9d6f79b721f",
+        "version" : "219.0.0"
       }
     },
     {
diff --git a/DuckDuckGo/EmailSignupViewController.swift b/DuckDuckGo/EmailSignupViewController.swift
index 056f861310..19b89ceb11 100644
--- a/DuckDuckGo/EmailSignupViewController.swift
+++ b/DuckDuckGo/EmailSignupViewController.swift
@@ -64,6 +64,7 @@ class EmailSignupViewController: UIViewController {
 
     lazy private var vaultManager: SecureVaultManager = {
         let manager = SecureVaultManager(includePartialAccountMatches: true,
+                                         shouldAllowPartialFormSaves: featureFlagger.isFeatureOn(.autofillPartialFormSaves),
                                          tld: AppDependencyProvider.shared.storageCache.tld)
         manager.delegate = self
         return manager
diff --git a/DuckDuckGo/SaveAutofillLoginManager.swift b/DuckDuckGo/SaveAutofillLoginManager.swift
index ea932d0ce0..4749b6dfd4 100644
--- a/DuckDuckGo/SaveAutofillLoginManager.swift
+++ b/DuckDuckGo/SaveAutofillLoginManager.swift
@@ -29,6 +29,7 @@ protocol SaveAutofillLoginManagerProtocol {
     var isPasswordOnlyAccount: Bool { get }
     var hasOtherCredentialsOnSameDomain: Bool { get }
     var hasSavedMatchingPasswordWithoutUsername: Bool { get }
+    var hasSavedMatchingUsernameWithoutPassword: Bool { get }
     var hasSavedMatchingUsername: Bool { get }
     
     static func saveCredentials(_ credentials: SecureVaultModels.WebsiteCredentials, with factory: AutofillVaultFactory) throws -> Int64
@@ -85,7 +86,15 @@ final class SaveAutofillLoginManager: SaveAutofillLoginManagerProtocol {
     var hasSavedMatchingUsername: Bool {
         savedMatchingUsernameCredential != nil
     }
-    
+
+    var hasSavedMatchingUsernameWithoutPassword: Bool {
+        if let savedMatchingUsernameCredential {
+            return savedMatchingUsernameCredential.password.flatMap { String(data: $0, encoding: .utf8) }.isNilOrEmpty
+        } else {
+            return false
+        }
+    }
+
     func prepareData(completion: @escaping () -> Void) {
         fetchDomainStoredCredentials { [weak self] credentials in
             self?.domainStoredCredentials = credentials
@@ -112,7 +121,7 @@ final class SaveAutofillLoginManager: SaveAutofillLoginManagerProtocol {
         let credentialsWithSameUsername = domainStoredCredentials.filter { $0.account.username == credentials.account.username }
         return credentialsWithSameUsername.first
     }
-    
+
     private func fetchDomainStoredCredentials(completion: @escaping ([SecureVaultModels.WebsiteCredentials]) -> Void) {
         DispatchQueue.global(qos: .userInteractive).async {
             var result = [SecureVaultModels.WebsiteCredentials]()
diff --git a/DuckDuckGo/SaveLoginView.swift b/DuckDuckGo/SaveLoginView.swift
index 2a738213d0..1b624ca3c4 100644
--- a/DuckDuckGo/SaveLoginView.swift
+++ b/DuckDuckGo/SaveLoginView.swift
@@ -264,6 +264,7 @@ private enum Const {
 
 struct SaveLoginView_Previews: PreviewProvider {
     private struct MockManager: SaveAutofillLoginManagerProtocol {
+        var hasSavedMatchingUsernameWithoutPassword: Bool { false }
 
         var username: String { "dax@duck.com" }
         var visiblePassword: String { "supersecurepasswordquack" }
diff --git a/DuckDuckGo/SaveLoginViewController.swift b/DuckDuckGo/SaveLoginViewController.swift
index 610e8bb0fb..31dad0e309 100644
--- a/DuckDuckGo/SaveLoginViewController.swift
+++ b/DuckDuckGo/SaveLoginViewController.swift
@@ -77,9 +77,11 @@ class SaveLoginViewController: UIViewController {
         case .savePassword:
             Pixel.fire(pixel: .autofillLoginsSavePasswordModalDismissed)
         case .updateUsername:
-            Pixel.fire(pixel: .autofillLoginsUpdateUsernameModalDismissed)
+            let isBackfilled = viewModel.isUpdatingEmptyUsername
+            Pixel.fire(pixel: .autofillLoginsUpdateUsernameModalDismissed, withAdditionalParameters: [PixelParameters.backfilled: String(describing: isBackfilled)])
         case .updatePassword:
-            Pixel.fire(pixel: .autofillLoginsUpdatePasswordModalDismissed)
+            let isBackfilled = viewModel.isUpdatingEmptyPassword
+            Pixel.fire(pixel: .autofillLoginsUpdatePasswordModalDismissed, withAdditionalParameters: [PixelParameters.backfilled: String(describing: isBackfilled)])
         }
         
         viewModel.viewControllerDidDisappear()
@@ -103,9 +105,11 @@ class SaveLoginViewController: UIViewController {
         case .savePassword:
             Pixel.fire(pixel: .autofillLoginsSavePasswordModalDisplayed)
         case .updateUsername:
-            Pixel.fire(pixel: .autofillLoginsUpdateUsernameModalDisplayed)
+            let isBackfilled = saveViewModel.isUpdatingEmptyUsername
+            Pixel.fire(pixel: .autofillLoginsUpdateUsernameModalDisplayed, withAdditionalParameters: [PixelParameters.backfilled: String(describing: isBackfilled)])
         case .updatePassword:
-            Pixel.fire(pixel: .autofillLoginsUpdatePasswordModalDisplayed)
+            let isBackfilled = saveViewModel.isUpdatingEmptyPassword
+            Pixel.fire(pixel: .autofillLoginsUpdatePasswordModalDisplayed, withAdditionalParameters: [PixelParameters.backfilled: String(describing: isBackfilled)])
         }
     }
 }
@@ -124,9 +128,11 @@ extension SaveLoginViewController: SaveLoginViewModelDelegate {
             delegate?.saveLoginViewController(self, didSaveCredentials: credentialManager.credentials)
         case .updatePassword, .updateUsername:
             if viewModel.layoutType == .updatePassword {
-                Pixel.fire(pixel: .autofillLoginsUpdatePasswordModalConfirmed)
+                let isBackfilled = viewModel.isUpdatingEmptyPassword
+                Pixel.fire(pixel: .autofillLoginsUpdatePasswordModalConfirmed, withAdditionalParameters: [PixelParameters.backfilled: String(describing: isBackfilled)])
             } else {
-                Pixel.fire(pixel: .autofillLoginsUpdateUsernameModalConfirmed)
+                let isBackfilled = viewModel.isUpdatingEmptyUsername
+                Pixel.fire(pixel: .autofillLoginsUpdateUsernameModalConfirmed, withAdditionalParameters: [PixelParameters.backfilled: String(describing: isBackfilled)])
             }
             delegate?.saveLoginViewController(self, didUpdateCredentials: credentialManager.credentials)
         }
diff --git a/DuckDuckGo/SaveLoginViewModel.swift b/DuckDuckGo/SaveLoginViewModel.swift
index d8adba63dc..b1e57ef935 100644
--- a/DuckDuckGo/SaveLoginViewModel.swift
+++ b/DuckDuckGo/SaveLoginViewModel.swift
@@ -88,10 +88,14 @@ final class SaveLoginViewModel: ObservableObject {
         credentialManager.hasSavedMatchingUsername
     }
     
-    var isUpdatingUsername: Bool {
+    var isUpdatingEmptyUsername: Bool {
         credentialManager.hasSavedMatchingPasswordWithoutUsername
     }
 
+    var isUpdatingEmptyPassword: Bool {
+        credentialManager.hasSavedMatchingUsernameWithoutPassword
+    }
+
     var hiddenPassword: String {
         PasswordHider(password: credentialManager.visiblePassword).hiddenPassword
     }
@@ -132,7 +136,7 @@ final class SaveLoginViewModel: ObservableObject {
             return .savePassword
         }
         
-        if isUpdatingUsername {
+        if isUpdatingEmptyUsername {
             return .updateUsername
         }
         
diff --git a/DuckDuckGo/TabViewController.swift b/DuckDuckGo/TabViewController.swift
index 5263815bf0..27f924cc7f 100644
--- a/DuckDuckGo/TabViewController.swift
+++ b/DuckDuckGo/TabViewController.swift
@@ -270,6 +270,7 @@ class TabViewController: UIViewController {
 
     lazy var vaultManager: SecureVaultManager = {
         let manager = SecureVaultManager(includePartialAccountMatches: true,
+                                         shouldAllowPartialFormSaves: featureFlagger.isFeatureOn(.autofillPartialFormSaves),
                                          tld: AppDependencyProvider.shared.storageCache.tld)
         manager.delegate = self
         return manager