1 files changed, 0 insertions, 82 deletions
diff --git a/browser/components/newtab/content-src/lib/detect-user-session-start.js b/browser/components/newtab/content-src/lib/detect-user-session-start.js
deleted file mode 100644
index 43aa388967..0000000000
--- a/browser/components/newtab/content-src/lib/detect-user-session-start.js
+++ /dev/null
@@ -1,82 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-import {
-  actionCreators as ac,
-  actionTypes as at,
-} from "common/Actions.sys.mjs";
-import { perfService as perfSvc } from "content-src/lib/perf-service";
-
-const VISIBLE = "visible";
-const VISIBILITY_CHANGE_EVENT = "visibilitychange";
-
-export class DetectUserSessionStart {
-  constructor(store, options = {}) {
-    this._store = store;
-    // Overrides for testing
-    this.document = options.document || global.document;
-    this._perfService = options.perfService || perfSvc;
-    this._onVisibilityChange = this._onVisibilityChange.bind(this);
-  }
-
-  /**
-   * sendEventOrAddListener - Notify immediately if the page is already visible,
-   *                    or else set up a listener for when visibility changes.
-   *                    This is needed for accurate session tracking for telemetry,
-   *                    because tabs are pre-loaded.
-   */
-  sendEventOrAddListener() {
-    if (this.document.visibilityState === VISIBLE) {
-      // If the document is already visible, to the user, send a notification
-      // immediately that a session has started.
-      this._sendEvent();
-    } else {
-      // If the document is not visible, listen for when it does become visible.
-      this.document.addEventListener(
-        VISIBILITY_CHANGE_EVENT,
-        this._onVisibilityChange
-      );
-    }
-  }
-
-  /**
-   * _sendEvent - Sends a message to the main process to indicate the current
-   *              tab is now visible to the user, includes the
-   *              visibility_event_rcvd_ts time in ms from the UNIX epoch.
-   */
-  _sendEvent() {
-    this._perfService.mark("visibility_event_rcvd_ts");
-
-    try {
-      let visibility_event_rcvd_ts =
-        this._perfService.getMostRecentAbsMarkStartByName(
-          "visibility_event_rcvd_ts"
-        );
-
-      this._store.dispatch(
-        ac.AlsoToMain({
-          type: at.SAVE_SESSION_PERF_DATA,
-          data: { visibility_event_rcvd_ts },
-        })
-      );
-    } catch (ex) {
-      // If this failed, it's likely because the `privacy.resistFingerprinting`
-      // pref is true.  We should at least not blow up.
-    }
-  }
-
-  /**
-   * _onVisibilityChange - If the visibility has changed to visible, sends a notification
-   *                      and removes the event listener. This should only be called once per tab.
-   */
-  _onVisibilityChange() {
-    if (this.document.visibilityState === VISIBLE) {
-      this._sendEvent();
-      this.document.removeEventListener(
-        VISIBILITY_CHANGE_EVENT,
-        this._onVisibilityChange
-      );
-    }
-  }
-}