diff --git a/browser/components/urlbar/UrlbarMuxerStandard.sys.mjs b/browser/components/urlbar/UrlbarMuxerStandard.sys.mjs
index cdc476a3eb2ee2cb6193d215513b65ed375f6153..bc66d9651e521bda75a3bb9e7f1e4b3bb325be90 100644
--- a/browser/components/urlbar/UrlbarMuxerStandard.sys.mjs
+++ b/browser/components/urlbar/UrlbarMuxerStandard.sys.mjs
@@ -855,6 +855,7 @@ class MuxerUnifiedComplete extends UrlbarMuxer {
     }
 
     if (result.providerName == lazy.UrlbarProviderTabToSearch.name) {
+      return false;
       // Discard the result if a tab-to-search result was added already.
       if (!state.canAddTabToSearch) {
         return false;
@@ -1501,7 +1502,9 @@ class MuxerUnifiedComplete extends UrlbarMuxer {
       usedLimits.maxResultCount++;
     }
 
+    if (!(result.heuristic && result.source == UrlbarUtils.RESULT_SOURCE.ZEN_ACTIONS)) {
     state.usedResultSpan += span;
+    }
     this._updateStatePostAdd(result, state);
 
     return true;