--- a/calendar/locales/en-US/chrome/calendar/migration.properties
+++ b/calendar/locales/en-US/chrome/calendar/migration.properties
@@ -4,10 +4,8 @@
 
 migratingApp = Migrating %1$S…
 
 # The next two lines are duplicated from migration.dtd until there is branding
 # for lightning
 migrationTitle = %1$S: Data Import
 migrationDescription=%1$S can import calendar data from many popular applications. Data from the following applications were found on your computer. Please select which of these you would like to import data from.
 finished = Complete
-disableExtTitle = Incompatible Extension Found
-disableExtText = You have the old Mozilla Calendar Extension installed which is not compatible with Lightning.  It will be disabled and %1$S will restart.