"DisableAppUpdate"=dword:00000001

      /* in this folder */

        /* and in */

On wife's laptop, got side tracked and said ok to Upgrade (thinking it was Mozilla Firefox) but it was actually for Thunderbird Email app. Realizing my mistake I quickly closed Thunderbird before it did the upgrade. We like the layout of version 102.15.1 and it's still running 102.15.1 on new starts. But now when we start Thunderbird, the Firefox browser immediately starts and goes to the below link, https://www.thunderbird.net/en-US/thunderbird/115.0/whatsnew/?locale=en-US&version=115.10.1&channel=release&oldversion=102.15.1 Have to close or minimize firefox to see Thunderbird. Need to find a way to get rid of this browser startup on Thunderbird. I've tried these below but they did not stop it. /* added this registry entry */ HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Thunderbird "DisableAppUpdate"=dword:00000001 /* also added a policies.json with the below text */ { "policies": { "DisableAppUpdate": true} } /* in this folder */ C:\Program Files (x86)\Mozilla Thunderbird\ /* and in */ C:\Program Files (x86)\Mozilla Thunderbird\distribution\ /* Edit Add, oh also I never check the */ When Thunderbird launches show the start page in Message area /* But even if it's checked it goes to another page not the link above */ /* The update-settings.ini has the below in it */ ; If you modify this file updates may fail. ; Do not modify this file. [Settings] ACCEPTED_MAR_CHANNEL_IDS=thunderbird-comm-release /* Anybody know where I can track down and delete where this browser startup if coming from? */