Bug 1866616 - Save the current date when starting a search from the search bar. r=dao,search-reviewers,daleharvey

Differential Revision: https://phabricator.services.mozilla.com/D194754

browser/components/search/content/searchbar.js

@@ -15,6 +15,7 @@
     FormHistory: "resource://gre/modules/FormHistory.sys.mjs",
     SearchSuggestionController:
       "resource://gre/modules/SearchSuggestionController.sys.mjs",
+    UrlbarPrefs: "resource:///modules/UrlbarPrefs.sys.mjs",
   });
 
   /**
@@ -425,6 +426,13 @@
         "searchbar",
         details
       );
+
+      // Record when the user uses the search bar
+      lazy.UrlbarPrefs.set(
+        "browser.search.widget.lastUsed",
+        new Date().toISOString()
+      );
+
       // null parameter below specifies HTML response for search
       let params = {
         postData: submission.postData,

browser/components/urlbar/UrlbarPrefs.sys.mjs

@@ -474,6 +474,9 @@ const PREF_URLBAR_DEFAULTS = new Map([
 
   // We only show recent searches within the past 31 days by default.
   ["recentsearches.expirationDays", 31],
+
+  // The last time (as ISO string) the user used the search bar.
+  ["browser.search.widget.lastUsed", ""],
 ]);
 
 const PREF_OTHER_DEFAULTS = new Map([