diff --git a/themes/fid_bbi/scss/base/form.scss b/themes/fid_bbi/scss/base/form.scss
index 767b9bb6cda505c48073b88ffd01bae180e81053..c35afed472b15b7e7f5a654fe545d93da21008ae 100644
--- a/themes/fid_bbi/scss/base/form.scss
+++ b/themes/fid_bbi/scss/base/form.scss
@@ -90,6 +90,8 @@ textarea {
   border-radius: 0; // Edge fix
   box-shadow: none;
   font-weight: 500;
+  // Fix for Firefox 78.11.0. ESR - remove when this release is outdated
+  height: 56px;
   max-width: 100%;
   min-width: 0; // Firefox fix
   padding: g(.5) - 2px;
diff --git a/themes/fid_bbi/scss/blocks/advanced-search.scss b/themes/fid_bbi/scss/blocks/advanced-search.scss
index dadbfb87e5d8d3f39bcb681969bb6432f6b51f99..9c4bee4890381bca59e0b8c385b913d58d544fd2 100644
--- a/themes/fid_bbi/scss/blocks/advanced-search.scss
+++ b/themes/fid_bbi/scss/blocks/advanced-search.scss
@@ -64,7 +64,8 @@
 
   .adv-input {
     flex: 1;
-    flex-basis: 60%;
+    // was 60% which doesn't work on Firefox 78.11.0. ESR - remove when this release is outdated
+    flex-basis: 59%;
     margin-bottom: g(.5);
     //width: calc(100% - #{g(2.5)}); // Space for "x" button