diff --git a/flake.lock b/flake.lock
index 774f394cd..9ed93f9fd 100644
--- a/flake.lock
+++ b/flake.lock
@@ -21,11 +21,11 @@
         "nixpkgs-lib": "nixpkgs-lib"
       },
       "locked": {
-        "lastModified": 1701473968,
-        "narHash": "sha256-YcVE5emp1qQ8ieHUnxt1wCZCC3ZfAS+SRRWZ2TMda7E=",
+        "lastModified": 1704152458,
+        "narHash": "sha256-DS+dGw7SKygIWf9w4eNBUZsK+4Ug27NwEWmn2tnbycg=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "34fed993f1674c8d06d58b37ce1e0fe5eebcb9f5",
+        "rev": "88a2cd8166694ba0b6cb374700799cec53aef527",
         "type": "github"
       },
       "original": {
@@ -106,11 +106,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1703499205,
-        "narHash": "sha256-lF9rK5mSUfIZJgZxC3ge40tp1gmyyOXZ+lRY3P8bfbg=",
+        "lastModified": 1704161960,
+        "narHash": "sha256-QGua89Pmq+FBAro8NriTuoO/wNaUtugt29/qqA8zeeM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "e1fa12d4f6c6fe19ccb59cac54b5b3f25e160870",
+        "rev": "63143ac2c9186be6d9da6035fa22620018c85932",
         "type": "github"
       },
       "original": {
@@ -123,11 +123,11 @@
     "nixpkgs-lib": {
       "locked": {
         "dir": "lib",
-        "lastModified": 1701253981,
-        "narHash": "sha256-ztaDIyZ7HrTAfEEUt9AtTDNoCYxUdSd6NrRHaYOIxtk=",
+        "lastModified": 1703961334,
+        "narHash": "sha256-M1mV/Cq+pgjk0rt6VxoyyD+O8cOUiai8t9Q6Yyq4noY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e92039b55bcd58469325ded85d4f58dd5a4eaf58",
+        "rev": "b0d36bd0a420ecee3bc916c91886caca87c894e9",
         "type": "github"
       },
       "original": {
diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index 75a0ce702..7f51fe0e8 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -666,6 +666,7 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
 
         // The cat
         m_settings->registerSetting("TheCat", false);
+        m_settings->registerSetting("CatOpacity", 100);
 
         m_settings->registerSetting("StatusBarVisible", true);
 
diff --git a/launcher/minecraft/MojangVersionFormat.cpp b/launcher/minecraft/MojangVersionFormat.cpp
index 6ee10ec15..bb782e47f 100644
--- a/launcher/minecraft/MojangVersionFormat.cpp
+++ b/launcher/minecraft/MojangVersionFormat.cpp
@@ -157,20 +157,6 @@ void MojangVersionFormat::readVersionProperties(const QJsonObject& in, VersionFi
     Bits::readString(in, "id", out->minecraftVersion);
     Bits::readString(in, "mainClass", out->mainClass);
     Bits::readString(in, "minecraftArguments", out->minecraftArguments);
-    if (out->minecraftArguments.isEmpty()) {
-        QString processArguments;
-        Bits::readString(in, "processArguments", processArguments);
-        QString toCompare = processArguments.toLower();
-        if (toCompare == "legacy") {
-            out->minecraftArguments = " ${auth_player_name} ${auth_session}";
-        } else if (toCompare == "username_session") {
-            out->minecraftArguments = "--username ${auth_player_name} --session ${auth_session}";
-        } else if (toCompare == "username_session_version") {
-            out->minecraftArguments = "--username ${auth_player_name} --session ${auth_session} --version ${profile_name}";
-        } else if (!toCompare.isEmpty()) {
-            out->addProblem(ProblemSeverity::Error, QObject::tr("processArguments is set to unknown value '%1'").arg(processArguments));
-        }
-    }
     Bits::readString(in, "type", out->type);
 
     Bits::readString(in, "assets", out->assets);
diff --git a/launcher/ui/instanceview/InstanceView.cpp b/launcher/ui/instanceview/InstanceView.cpp
index e665097f4..6f3812a62 100644
--- a/launcher/ui/instanceview/InstanceView.cpp
+++ b/launcher/ui/instanceview/InstanceView.cpp
@@ -458,6 +458,7 @@ void InstanceView::paintEvent([[maybe_unused]] QPaintEvent* event)
     QPainter painter(this->viewport());
 
     if (m_catVisible) {
+        painter.setOpacity(APPLICATION->settings()->get("CatOpacity").toFloat() / 100);
         int widWidth = this->viewport()->width();
         int widHeight = this->viewport()->height();
         if (m_catPixmap.width() < widWidth)
@@ -468,6 +469,7 @@ void InstanceView::paintEvent([[maybe_unused]] QPaintEvent* event)
         QRect rectOfPixmap = pixmap.rect();
         rectOfPixmap.moveBottomRight(this->viewport()->rect().bottomRight());
         painter.drawPixmap(rectOfPixmap.topLeft(), pixmap);
+        painter.setOpacity(1.0);
     }
 
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
diff --git a/launcher/ui/pages/global/LauncherPage.cpp b/launcher/ui/pages/global/LauncherPage.cpp
index d15883db5..78c44380a 100644
--- a/launcher/ui/pages/global/LauncherPage.cpp
+++ b/launcher/ui/pages/global/LauncherPage.cpp
@@ -221,6 +221,9 @@ void LauncherPage::applySettings()
             break;
     }
 
+    // Cat
+    s->set("CatOpacity", ui->catOpacitySpinBox->value());
+
     // Mods
     s->set("ModMetadataDisabled", ui->metadataDisableBtn->isChecked());
     s->set("ModDependenciesDisabled", ui->dependenciesDisableBtn->isChecked());
@@ -276,6 +279,9 @@ void LauncherPage::loadSettings()
         ui->sortByNameBtn->setChecked(true);
     }
 
+    // Cat
+    ui->catOpacitySpinBox->setValue(s->get("CatOpacity").toInt());
+
     // Mods
     ui->metadataDisableBtn->setChecked(s->get("ModMetadataDisabled").toBool());
     ui->metadataWarningLabel->setHidden(!ui->metadataDisableBtn->isChecked());
diff --git a/launcher/ui/pages/global/LauncherPage.ui b/launcher/ui/pages/global/LauncherPage.ui
index 83897f7a7..18b52e1b8 100644
--- a/launcher/ui/pages/global/LauncherPage.ui
+++ b/launcher/ui/pages/global/LauncherPage.ui
@@ -186,7 +186,7 @@
             </property>
            </widget>
           </item>
-           <item>
+          <item>
            <widget class="QCheckBox" name="dependenciesDisableBtn">
             <property name="toolTip">
              <string>Disable the automatic detection, installation, and updating of mod dependencies.</string>
@@ -300,6 +300,54 @@
          </layout>
         </widget>
        </item>
+       <item>
+        <widget class="QGroupBox" name="catBox">
+         <property name="title">
+          <string>Cat</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_5">
+          <item row="0" column="0">
+           <widget class="QLabel" name="catOpacityLabel">
+            <property name="toolTip">
+             <string>Set the cat's opacity. 0% is fully transparent and 100% is fully opaque.</string>
+            </property>
+            <property name="text">
+             <string>Opacity</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="2">
+           <widget class="QSpinBox" name="catOpacitySpinBox">
+            <property name="specialValueText">
+             <string/>
+            </property>
+            <property name="suffix">
+             <string>%</string>
+            </property>
+            <property name="maximum">
+             <number>100</number>
+            </property>
+            <property name="value">
+             <number>0</number>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <spacer name="horizontalSpacer">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+         </layout>
+        </widget>
+       </item>
        <item>
         <widget class="QGroupBox" name="toolsBox">
          <property name="sizePolicy">
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.cpp b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
index 74785f97e..d4fd0ec5b 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.cpp
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
@@ -346,7 +346,7 @@ void InstanceSettingsPage::loadSettings()
 #ifdef Q_OS_LINUX
     ui->lineEditOpenALPath->setPlaceholderText(APPLICATION->m_detectedOpenALPath);
 #else
-    ui->lineEditGLFWPath->setPlaceholderText(tr("Path to %1 library file").arg(BuildConfig.OPENAL_LIBRARY_NAME));
+    ui->lineEditOpenALPath->setPlaceholderText(tr("Path to %1 library file").arg(BuildConfig.OPENAL_LIBRARY_NAME));
 #endif
 
     // Performance
diff --git a/libraries/launcher/legacy/org/prismlauncher/legacy/fix/online/OnlineModeFix.java b/libraries/launcher/legacy/org/prismlauncher/legacy/fix/online/OnlineModeFix.java
index 5ed33b85c..1bab76d53 100644
--- a/libraries/launcher/legacy/org/prismlauncher/legacy/fix/online/OnlineModeFix.java
+++ b/libraries/launcher/legacy/org/prismlauncher/legacy/fix/online/OnlineModeFix.java
@@ -35,14 +35,14 @@
 
 package org.prismlauncher.legacy.fix.online;
 
+import org.prismlauncher.legacy.utils.url.UrlUtils;
+
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.Proxy;
 import java.net.URL;
 import java.net.URLConnection;
 
-import org.prismlauncher.legacy.utils.url.UrlUtils;
-
 public final class OnlineModeFix {
     public static URLConnection openConnection(URL address, Proxy proxy) throws IOException {
         // we start with "http://www.minecraft.net/game/joinserver.jsp?user=..."