6 files declare their use of FormHelper in Simple XML sitemap 4.x

SearchEngineListBuilder.php in modules/simple_sitemap_engines/src/Controller/SearchEngineListBuilder.php

SimpleSitemapDisplayExtender.php in modules/simple_sitemap_views/src/Plugin/views/display_extender/SimpleSitemapDisplayExtender.php

SimplesitemapEnginesForm.php in modules/simple_sitemap_engines/src/Form/SimplesitemapEnginesForm.php

SimpleSitemapListBuilder.php in src/SimpleSitemapListBuilder.php

SimpleSitemapTypeListBuilder.php in src/SimpleSitemapTypeListBuilder.php

SimpleSitemapViewsController.php in modules/simple_sitemap_views/src/Controller/SimpleSitemapViewsController.php