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</source>
=== Disable Migration Assistant and Welcome What's New page ===To prevent the Migration Assistant and the welcome What's New page from showing after upgrades add the following lines to your thunderbird.cfg.
<source lang=javascript>
lockPref("app.update.showInstalledUI", false);
lockPref("browser.startup.homepage_override.mstone", "ignore");
lockPref("mailnews.start_page_override.mstone", "ignore");
</source>
[[category:Silent Installers]]