Bug 1787003 - Adjust font size of tab pickup timestamp r=niklas

Differential Revision: https://phabricator.services.mozilla.com/D156868

browser/components/firefoxview/firefoxview.css

@@ -758,11 +758,14 @@ details[open] > .page-section-header > .twisty {
 
 .synced-tab-li-url,
 .synced-tab-li-device,
-.synced-tab-li-time,
 .synced-tab-li:not(:first-child) > .synced-tab-a > .synced-tab-li-title {
   font-size: .85em;
 }
 
+.synced-tab-li-time {
+  font-size: .75em;
+}
+
 .synced-tab-li-url {
   text-decoration-line: underline;
   grid-area: domain;