2016317 - Browser Privacy strict mode slower my firefox and cause some little freeze when open background tabs

Status: UNCONFIRMED

(Core :: Privacy: Anti-Tracking, defect)

Description

[mix5003]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0

Steps to reproduce:

1. Set Browser Privacy to strict mode
2. go to https://www.blognone.com/
3. ctrl + click (or right click and open in new tab) at first 4 top article.

Actual results:

firefox will noticeable lag and a little unresponsive compare to standard browser privacy.
and this will occurs when open a tab in background only. if you refresh tab or normal click link it will not occurs this issue

Expected results:

it should fast like standard browser privacy.

profiler in Nightly Mode:
normal:
https://share.firefox.dev/4rLMi46

strict
https://share.firefox.dev/4rF2mEG

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::JavaScript Engine' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[André Bargull [:anba]]

This looks like overhead from https://searchfox.org/firefox-main/source/browser/extensions/webcompat/lib/smartblock_embeds_helper.js. Moving to "Privacy: Anti-Tracking".