Show proper Windows download link based on architecture

Author: bluewave41

media/css/cms/pages/flare26-channels.css

@@ -172,6 +172,19 @@ ul.download-list strong {
     display: block !important;
 }
 
+/* 64-bit UA detection for Firefox on Windows (issue #8635) */
+.windows .download-button .os_win {
+    display: block !important;
+}
+
+.windows.x64 .download-button .os_win64 {
+    display: block !important;
+}
+
+.windows.x64 .download-button .os_win {
+    display: none !important;
+}
+
 /* add spacing between displayed buttons */
 .download-list {
     display: grid;

media/css/protocol/components/_download-button.scss

@@ -88,7 +88,6 @@ ul.download-list {
 .linux .download-button .os_linux,
 .linux .download-button .os_linux64,
 .linux .download-button .os_linux64-aarch64,
-.windows .download-button .os_win,
 .osx .download-button .os_osx,
 .android .download-button .os_android,
 .download-button-android .os_android,
@@ -101,6 +100,19 @@ ul.download-list {
     display: block !important;
 }
 
+// 64-bit UA detection for Firefox on Windows (issue #8635)
+.windows .download-button .os_win {
+    display: block !important;
+}
+
+.windows.x64 .download-button .os_win64 {
+    display: block !important;
+}
+
+.windows.x64 .download-button .os_win {
+    display: none !important;
+}
+
 // add spacing between displayed buttons
 .download-list {
     display: grid;