--- a/mobile/android/chrome/content/config.js
+++ b/mobile/android/chrome/content/config.js
@@ -204,16 +204,22 @@ var AboutConfig = {
     this._prefsContainer = document.getElementById("prefs-container");
     this._loadingContainer = document.getElementById("loading-container");
 
     let list = Services.prefs.getChildList("");
     this._list = list.sort().map( function AC_getMapPref(aPref) {
       return new Pref(aPref);
     }, this);
 
+    // Support filtering about:config via a ?filter=<string> param
+    let match = /[?&]filter=([^&]+)/i.exec(window.location.href);
+    if (match) {
+      this.filterInput.value = decodeURIComponent(match[1]);
+    }
+
     // Display the current prefs list (retains searchFilter value)
     this.bufferFilterInput();
 
     // Setup the prefs observers
     Services.prefs.addObserver("", this, false);
   },
 
   // Uninit the main AboutConfig dialog