Mozilla Firefox 102, Mozilla Firefox ESR 91.11, Mozilla Thunderbird 91.11 and Mozilla Thunderbird 102: The ms-msdt, search, and search-ms protocols deliver content to Microsoft applications, bypassing the browser, when a user accepts a prompt. These applications have had known vulnerabilities, exploited in the wild (although we know of none exploited through Firefox), so in this release Firefox has blocked these protocols from prompting the user to open them.