This addons injects a redirect over the developers alitems.com URL, in order to inject their own referral link without the users knowledge in order to make money. I verified this behaviour by checking the source code of this addon.
Mozilla Firefox 89.0b14 (64-bit), Night mode for Aliexpress com English 0.0.49 (20 May 2021) — on the msg.aliexpress.ru does not work. После удаления открывает страницу дополнения в магазине дополнений для Google Chrome.