diff --git a/chrome/content/zotero-platform/unix/overlay.css b/chrome/content/zotero-platform/unix/overlay.css
index 3500fe859..ca2f342dc 100644
--- a/chrome/content/zotero-platform/unix/overlay.css
+++ b/chrome/content/zotero-platform/unix/overlay.css
@@ -124,4 +124,10 @@
 
 #zotero-tb-search .textbox-search-icon {
 	visibility: hidden;
+}
+
+/* As of Fx37, the tree doesn't scale HiDPI images properly on Linux */
+#zotero-collections-tree treechildren::-moz-tree-image,
+#zotero-items-tree treechildren::-moz-tree-image {
+	height: 16px;
 }
\ No newline at end of file