Update status for Firefox 55

tests/corelib_2/corelib_2.status

Index: tests/corelib_2/corelib_2.status
diff --git a/tests/corelib_2/corelib_2.status b/tests/corelib_2/corelib_2.status
index 58463e9b9a7b0df582b2f3ed859701c6f51795c9..f6f7adb77d9ec5bf312dac03f59e2ac3796d4c69 100644
--- a/tests/corelib_2/corelib_2.status
+++ b/tests/corelib_2/corelib_2.status
@@ -307,6 +307,10 @@ string_from_environment3_test/05: MissingCompileTimeError
 double_parse_test/02: Fail, OK
 unicode_test: Fail
 
+[ $runtime == ff && $system == windows ]
+unicode_test: Pass # When Linux FF updates to 55, remove the fail status from FF in the other status line for this file.
+string_case_test/01: Pass # When Linux FF updates to 55, remove the fail status from FF in the other status line for this file.
+
 [ ($runtime == vm || $runtime == dart_precompiled) && $arch == simarmv5te ]
 big_integer_parsed_mul_div_vm_test: Pass, SloW
 int_parse_radix_test/*: Pass, Slow
@@ -442,7 +446,7 @@ from_environment_const_type_undefined_test/16: MissingCompileTimeError
 string_base_vm_static_test: MissingCompileTimeError
 
 [ $compiler == dart2js && ($runtime == ff || $runtime == jsshell) ]
-string_case_test/01: Fail, OK # Bug in Firefox.
+string_case_test/01: Fail, OK # Bug in Firefox. Change to jsshell fail only once linux updates to 55.
 regexp/UC16_test: RuntimeError
 
 [ $compiler == none && $runtime == drt ]