diff -uNrBbwp palemoon-29.4.6/palemoon/palemoon/app/profile/palemoon.js palemoon-29.4.6-new/palemoon/palemoon/app/profile/palemoon.js
--- palemoon-29.4.6/palemoon/palemoon/app/profile/palemoon.js	2022-05-07 15:30:02.000000000 +0000
+++ palemoon-29.4.6-new/palemoon/palemoon/app/profile/palemoon.js	2022-05-07 20:13:05.163064568 +0000
@@ -243,7 +243,7 @@ pref("general.autoScroll", true);
 pref("general.useragent.complexOverride.moodle", false); // bug 797703
 
 // At startup, check if we're the default browser and prompt user if not.
-pref("browser.shell.checkDefaultBrowser", true);
+pref("browser.shell.checkDefaultBrowser", false);
 pref("browser.shell.shortcutFavicons",true);
 pref("browser.shell.mostRecentDateSetAsDefault", "");
 pref("browser.shell.skipDefaultBrowserCheckOnFirstRun", false);