Is there a way to troubleshoot and fix the ‘Your connection is not secure’ error message in Mozilla Firefox, and what steps should I take to ensure my browsing is secure while avoiding this issue
if you had install any system-wide adblocker such as adguard, that could result in similar issue. also, please try refresh Firefox first, https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings