From mozilla's "what's new":
98.0.1
Firefox Release
March 14, 2022
Version 98.0.1, first offered to Release channel users on March 14, 2022
Changed
Yandex and Mail.ru have been removed as optional search providers in the drop-down search menu in Firefox.
If you previously installed a customized version of Firefox with Yandex or Mail.ru, offered through partner distribution channels, this release removes those customizations, including add-ons and default bookmarks. Where applicable, your browser will revert back to default settings, as offered by Mozilla. All other releases of Firefox remain unaffected by the change.
