[BASILISK] Restore Tabs from Other Devices history menu item and Add First Sync Progress

application/basilisk/themes/linux/syncProgress.css

@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+@import url(chrome://global/skin/inContentUI.css);
+
+:root {
+  height: 100%;
+  width: 100%;
+  padding: 0;
+}
+
+body {
+  margin: 0;
+  padding: 0 2em;
+}
+
+#floatingBox {
+  margin: 4em auto;
+  max-width: 40em;
+  min-width: 23em;
+  padding: 1em 1.5em;
+  position: relative;
+  text-align: center;
+}
+
+#successLogo {
+  margin: 1em 2em;
+}
+
+#loadingText {
+  margin: 2em 6em;
+}
+
+#progressBar {
+  margin: 2em 10em;
+}
+
+#uploadProgressBar{
+  width: 100%;
+}
+
+#bottomRow {
+  margin-top: 2em;
+  padding: 0;
+  text-align: end;
+}