--- a/testing/web-platform/tests/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/testing/web-platform/tests/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -142,18 +142,18 @@ def run_info_extras(**kwargs):
 
 def update_properties():
     return (["debug", "webrender", "e10s", "os", "version", "processor", "bits"],
             {"debug", "e10s", "webrender"})
 
 
 class FirefoxBrowser(Browser):
     used_ports = set()
-    init_timeout = 60
-    shutdown_timeout = 60
+    init_timeout = 70
+    shutdown_timeout = 70
 
     def __init__(self, logger, binary, prefs_root, test_type, extra_prefs=None, debug_info=None,
                  symbols_path=None, stackwalk_binary=None, certutil_binary=None,
                  ca_certificate_path=None, e10s=False, stackfix_dir=None,
                  binary_args=None, timeout_multiplier=None, leak_check=False, asan=False,
                  stylo_threads=1, chaos_mode_flags=None, config=None):
         Browser.__init__(self, logger)
         self.binary = binary