Update UI and catch executeScript errors now shown in Canary

go-back-with-backspace/pages/popup.css

Index: go-back-with-backspace/pages/popup.css
diff --git a/go-back-with-backspace/pages/popup.css b/go-back-with-backspace/pages/popup.css
index 3dabde5543ce07ffeaa34bf25f213e85108db8d4..db1da7e78b3066b85486351ba40cb8ffa756c750 100644
--- a/go-back-with-backspace/pages/popup.css
+++ b/go-back-with-backspace/pages/popup.css
@@ -6,35 +6,85 @@
 
 body {
   direction: __MSG_@@bidi_dir__;
-  width: 300px;
+  margin: 0;
+  text-align: center;
+  width: 270px;
 }
 
-#list_edit_button, #messages  {
+h1 {
+  -webkit-margin-start: 8px;
+  font-size: 17px;
+  margin-top: 4px;
+  text-align: left;
+}
+
+.bottom-bar {
+  align-items: center;
+  background-color: rgb(241, 241, 241);
+  border-top: 1px solid rgb(204, 204, 204);
+  height: 33px;
+  margin-top: 2px;
+  padding: 0 5px;
+}
+
+.bottom-bar > span {
+  padding-top: 5px;
+}
+
+.button-image {
+  background-position: center;
+  background-repeat: no-repeat;
+  background-size: 20px 20px;
+  cursor: pointer;
+  height: 24px;
+  opacity: .54;
+  outline: none;
+  width: 24px;
+}
+
+#list-edit-button {
+  background-image: -webkit-linear-gradient(top,
+                                            rgb(77, 144, 254),
+                                            rgb(71, 135, 237));
+  border: 1px solid rgb(48, 121, 237);
+  border-radius: 2px;
+  color: white;
+  display: inline-block;
+  font-size: 13px;
+  height: 30px;
+  line-height: 30px;
   margin-bottom: 10px;
+  padding: 0 8px;
+}
+
+#list-edit-button:hover:enabled {
+  background-image: -webkit-linear-gradient(top,
+                                            rgb(77, 144, 254)
+                                            rgb(53, 122, 232));
+  border: 1px solid rgb(47, 91, 183);
 }
 
-#list_edit_button {
-  margin-top: 10px;
+#list-edit-button:disabled {
+  opacity: 0.5;
 }
 
-#current_url {
-  text-overflow: ellipsis;
-  white-space: nowrap;
-  overflow: hidden;
+#file-url-message {
+  margin-bottom: 5px;
 }
 
 #status {
   color: green;
+  line-height: 33px;
 }
 
 #status.error {
   color: red;
 }
 
-#report_page {
+#feedback-button {
   float: __MSG_@@bidi_start_edge__;
 }
 
-#open_options {
+#options-button {
   float: __MSG_@@bidi_end_edge__;
 }