If nothing else works, your Firefox profile might be corrupted. Refreshing Firefox resets settings to default while keeping bookmarks and passwords.
How to Unblock a Site in Firefox: A Comprehensive Guide When Mozilla Firefox blocks a website, it is usually attempting to protect your privacy, security, or data. However, these blocks can sometimes be false positives, or you may simply need to bypass a restriction imposed by a network administrator, school, or government. how to unblock a site in firefox