--- a/browser/components/preferences/in-content-new/findInPage.js
+++ b/browser/components/preferences/in-content-new/findInPage.js
@@ -220,16 +220,21 @@ var gSearchResultsPane = {
    *    to search for filted query in
    */
   searchFunction(event) {
     this.query = event.target.value.trim().toLowerCase();
     this.getFindSelection(window).removeAllRanges();
     this.removeAllSearchTooltips();
     this.removeAllSearchMenuitemIndicators();
 
+    // Clear telemetry request if user types very frequently.
+    if (this.telemetryTimer) {
+      clearTimeout(this.telemetryTimer);
+    }
+
     let srHeader = document.getElementById("header-searchResults");
 
     if (this.query) {
       // Showing the Search Results Tag
       gotoPref("paneSearchResults");
 
       let resultsFound = false;
 
@@ -269,16 +274,23 @@ var gSearchResultsPane = {
         let helpUrl = Services.urlFormatter.formatURLPref("app.support.baseURL") + "preferences";
         let brandName = document.getElementById("bundleBrand").getString("brandShortName");
         // eslint-disable-next-line no-unsanitized/property
         document.getElementById("need-help").innerHTML =
           strings.getFormattedString("searchResults.needHelp2", [helpUrl, brandName]);
       } else {
         // Creating tooltips for all the instances found
         this.listSearchTooltips.forEach((anchorNode) => this.createSearchTooltip(anchorNode, this.query));
+
+        // Implant search telemetry probe after user stops typing for a while
+        if (this.query.length >= 2) {
+          this.telemetryTimer = setTimeout(() => {
+            Services.telemetry.keyedScalarAdd("preferences.search_query", this.query, 1);
+          }, 1000);
+        }
       }
     } else {
       document.getElementById("sorry-message").textContent = "";
       // Going back to General when cleared
       gotoPref("paneGeneral");
     }
   },
 

--- a/toolkit/components/telemetry/Scalars.yaml
+++ b/toolkit/components/telemetry/Scalars.yaml
@@ -393,16 +393,31 @@ preferences:
       Set to true if user.js exists and was read.
     expires: "62"
     kind: boolean
     notification_emails:
       - bsmedberg@mozilla.com
     release_channel_collection: opt-out
     record_in_processes:
       - main
+  search_query:
+    bug_numbers:
+      - 1359306
+    description: >-
+      Each key is a search query string when user performs a search action within
+      about:preferences, and each value is the number of times that key is recorded.
+      The telemetry data will be recorded if there is a successful search result highlighted.
+    expires: "62"
+    kind: uint
+    keyed: true
+    notification_emails:
+      - chsiang@mozilla.com
+    release_channel_collection: opt-in
+    record_in_processes:
+      - main
 
 # The following section contains WebRTC nICEr scalars
 # For more info on ICE, see https://tools.ietf.org/html/rfc5245
 # For more info on STUN, see https://tools.ietf.org/html/rfc5389
 # For more info on TURN, see https://tools.ietf.org/html/rfc5766
 webrtc.nicer:
   stun_retransmits:
     bug_numbers: