Fixing single line code block on firefox

web/react/utils/markdown.jsx

@@ -151,6 +151,10 @@ class MattermostMarkdownRenderer extends marked.Renderer {
         );
     }
 
+    codespan(text) {
+        return '<pre class="text-nowrap">' + super.codespan(text) + '</pre>';
+    }
+
     br() {
         if (this.formattingOptions.singleline) {
             return ' ';

web/sass-files/sass/partials/_markdown.scss

@@ -54,6 +54,13 @@
 	code {
 		white-space: pre;
 	}
+	pre {
+		&.text-nowrap {
+			code {
+				white-space: nowrap;
+			}
+		}
+	}
 }
 .markdown__table {
 	background: #fff;