Bug 1326546 - Fix icon for about:sync-tabs on Firefox RTL r=markh

MozReview-Commit-ID: GR0Oe4GYtyh

--HG--
extra : rebase_source : 8a58fc32909f2fb3b222233ad47e07976b8cbb47

browser/themes/linux/aboutSyncTabs.css

@@ -26,6 +26,10 @@
   margin-inline-end: 2em;
 }
 
+#headers:-moz-locale-dir(rtl) {
+  background-position-x: 100%;
+}
+
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;

browser/themes/osx/aboutSyncTabs.css

@@ -26,6 +26,10 @@
   margin-inline-end: 2em;
 }
 
+#headers:-moz-locale-dir(rtl) {
+  background-position-x: 100%;
+}
+
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;

browser/themes/windows/aboutSyncTabs.css

@@ -26,6 +26,10 @@
   margin-inline-end: 2em;
 }
 
+#headers:-moz-locale-dir(rtl) {
+  background-position-x: 100%;
+}
+
 #tabsListHeading {
   font-size: 140%;
   font-weight: bold;