diff --git a/ShareX.HelpersLib/Native/NativeMethods_Helpers.cs b/ShareX.HelpersLib/Native/NativeMethods_Helpers.cs
index bc69ffb53..f48dcc198 100644
--- a/ShareX.HelpersLib/Native/NativeMethods_Helpers.cs
+++ b/ShareX.HelpersLib/Native/NativeMethods_Helpers.cs
@@ -235,11 +235,16 @@ public static bool UseImmersiveDarkMode(IntPtr handle, bool enabled)
         {
             if (Helpers.IsWindows10OrGreater(17763))
             {
-                var attribute = DwmWindowAttribute.DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1;
+                DwmWindowAttribute attribute;
+
                 if (Helpers.IsWindows10OrGreater(18985))
                 {
                     attribute = DwmWindowAttribute.DWMWA_USE_IMMERSIVE_DARK_MODE;
                 }
+                else
+                {
+                    attribute = DwmWindowAttribute.DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_20H1;
+                }
 
                 int useImmersiveDarkMode = enabled ? 1 : 0;
                 return DwmSetWindowAttribute(handle, (int)attribute, ref useImmersiveDarkMode, sizeof(int)) == 0;
diff --git a/ShareX.UploadersLib/TextUploaders/GitHubGist.cs b/ShareX.UploadersLib/TextUploaders/GitHubGist.cs
index 9edcac3fb..ad1d857a1 100644
--- a/ShareX.UploadersLib/TextUploaders/GitHubGist.cs
+++ b/ShareX.UploadersLib/TextUploaders/GitHubGist.cs
@@ -117,15 +117,6 @@ public override UploadResult UploadText(string text, string fileName)
 
             if (!string.IsNullOrEmpty(text) && !string.IsNullOrEmpty(fileName))
             {
-                var gistUploadObject = new
-                {
-                    @public = PublicUpload,
-                    files = new Dictionary<string, object>
-                    {
-                        { fileName, new { content = text } }
-                    }
-                };
-
                 string url;
 
                 if (!string.IsNullOrEmpty(CustomURLAPI))
@@ -139,7 +130,17 @@ public override UploadResult UploadText(string text, string fileName)
 
                 url = URLHelpers.CombineURL(url, "gists");
 
-                string json = JsonConvert.SerializeObject(gistUploadObject);
+                GistUpload gistUpload = new GistUpload()
+                {
+                    description = "",
+                    @public = PublicUpload,
+                    files = new Dictionary<string, GistUploadFileInfo>()
+                    {
+                        { fileName, new GistUploadFileInfo() { content = text } }
+                    }
+                };
+
+                string json = JsonConvert.SerializeObject(gistUpload);
 
                 Dictionary<string, string> args = new Dictionary<string, string>();
                 args.Add("access_token", AuthInfo.Token.access_token);
@@ -164,13 +165,25 @@ public override UploadResult UploadText(string text, string fileName)
             return ur;
         }
 
+        private class GistUpload
+        {
+            public string description { get; set; }
+            public bool @public { get; set; }
+            public Dictionary<string, GistUploadFileInfo> files { get; set; }
+        }
+
+        private class GistUploadFileInfo
+        {
+            public string content { get; set; }
+        }
+
         private class GistResponse
         {
             public string html_url { get; set; }
-            public Dictionary<string, GistFileInfo> files { get; set; }
+            public Dictionary<string, GistResponseFileInfo> files { get; set; }
         }
 
-        private class GistFileInfo
+        private class GistResponseFileInfo
         {
             public string filename { get; set; }
             public string raw_url { get; set; }
diff --git a/ShareX/ChromeManifest.cs b/ShareX/ChromeManifest.cs
new file mode 100644
index 000000000..29c8a638b
--- /dev/null
+++ b/ShareX/ChromeManifest.cs
@@ -0,0 +1,36 @@
+#region License Information (GPL v3)
+
+/*
+    ShareX - A program that allows you to take screenshots and share any file type
+    Copyright (c) 2007-2019 ShareX Team
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; either version 2
+    of the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
+*/
+
+#endregion License Information (GPL v3)
+
+namespace ShareX
+{
+    public class ChromeManifest
+    {
+        public string name { get; set; }
+        public string description { get; set; }
+        public string path { get; set; }
+        public string type { get; set; }
+        public string[] allowed_origins { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/ShareX/FirefoxManifest.cs b/ShareX/FirefoxManifest.cs
new file mode 100644
index 000000000..24b15787e
--- /dev/null
+++ b/ShareX/FirefoxManifest.cs
@@ -0,0 +1,36 @@
+#region License Information (GPL v3)
+
+/*
+    ShareX - A program that allows you to take screenshots and share any file type
+    Copyright (c) 2007-2019 ShareX Team
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; either version 2
+    of the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
+*/
+
+#endregion License Information (GPL v3)
+
+namespace ShareX
+{
+    public class FirefoxManifest
+    {
+        public string name { get; set; }
+        public string description { get; set; }
+        public string path { get; set; }
+        public string type { get; set; }
+        public string[] allowed_extensions { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/ShareX/IntegrationHelpers.cs b/ShareX/IntegrationHelpers.cs
index e6e6ab49c..60e332596 100644
--- a/ShareX/IntegrationHelpers.cs
+++ b/ShareX/IntegrationHelpers.cs
@@ -253,7 +253,7 @@ private static void CreateChromeHostManifest(string filepath)
         {
             Helpers.CreateDirectoryFromFilePath(filepath);
 
-            var manifest = new
+            ChromeManifest manifest = new ChromeManifest()
             {
                 name = "com.getsharex.sharex",
                 description = "ShareX",
@@ -323,7 +323,7 @@ private static void CreateFirefoxHostManifest(string filepath)
         {
             Helpers.CreateDirectoryFromFilePath(filepath);
 
-            var manifest = new
+            FirefoxManifest manifest = new FirefoxManifest()
             {
                 name = "ShareX",
                 description = "ShareX",
diff --git a/ShareX/ShareX.csproj b/ShareX/ShareX.csproj
index fce098feb..d8f8729f5 100644
--- a/ShareX/ShareX.csproj
+++ b/ShareX/ShareX.csproj
@@ -149,6 +149,7 @@
     <Compile Include="CaptureHelpers\CaptureMonitor.cs" />
     <Compile Include="CaptureHelpers\CaptureRegion.cs" />
     <Compile Include="CaptureHelpers\CaptureWindow.cs" />
+    <Compile Include="ChromeManifest.cs" />
     <Compile Include="Controls\BeforeUploadControl.cs">
       <SubType>UserControl</SubType>
     </Compile>
@@ -178,6 +179,7 @@
     </Compile>
     <Compile Include="EasterEggAboutAnimation.cs" />
     <Compile Include="EasterEggBounce.cs" />
+    <Compile Include="FirefoxManifest.cs" />
     <Compile Include="Forms\TextUploadForm.cs">
       <SubType>Form</SubType>
     </Compile>