--- a/devtools/client/framework/connect/connect.css
+++ b/devtools/client/framework/connect/connect.css
@@ -37,17 +37,21 @@ label {
 label > span {
   display: inline-block;
   min-width: 150px;
   text-align: end;
   margin-inline-end: 10px;
 }
 
 #submit {
-  float: inline-end;
+  float: right;
+}
+
+#submit:dir(rtl) {
+  float: left;
 }
 
 input {
   direction: ltr;
 }
 
 input:invalid {
   box-shadow: 0 0 2px 2px #F06;