Well, the Release Notes from Firefox for version 98.0.1 say this:
Quote:
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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.
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https://www.mozilla.org/en-US/firefo.../releasenotes/