parser/html/nsHtml5Highlighter.cpp:572:9 [-Wimplicit-fallthrough] unannotated fall-through between switch labels parser/htmlparser/nsScanner.cpp:425:7 [-Wimplicit-fallthrough] unannotated fall-through between switch labels parser/htmlparser/nsScanner.cpp:780:7 [-Wimplicit-fallthrough] unannotated fall-through between switch labels