Put back skipif GHA

Author: Tracy-Walker

tests/tabs/test_mute_tabs.py

@@ -1,3 +1,5 @@
+from os import environ
+
 import pytest
 from selenium.webdriver import Firefox
 from selenium.webdriver.common.by import By
@@ -21,6 +23,10 @@ def add_to_prefs_list():
     return [("network.cookie.cookieBehavior", "2")]
 
 
+GHA = environ.get("GITHUB_ACTIONS") == "true"
+
+
+@pytest.mark.skipif(GHA, reason="Test unstable in Github Actions")
 @pytest.mark.audio
 def test_mute_unmute_tab(screenshot, driver: Firefox, video_url: str):
     """C134719, test that tabs can be muted and unmuted"""