Sometimes Firefox isn't the culprit—it’s the security software on your computer. Antivirus suites (like Avast, McAfee, or Norton) and Windows Family Safety can block sites at the system level.
For Windows Family Safety:
For Antivirus Software:
Firefox has two native features that might be blocking access: HTTPS-Only Mode and Proxy settings. Additionally, if you have Firefox Lockwise or parental control software integrated, that could be the culprit.
Some extensions block specific sites.
To check:
Common blocking extensions: uBlock Origin, AdBlock Plus, BlockTube, LeechBlock, parental control tools. how to unblock a site in firefox
Pro Tip: The extension "Smart HTTPS" or "HTTP Everywhere" can break sites that have mixed content. Disable these immediately if you have them.
If Firefox is configured to use a proxy that blocks certain sites: For Antivirus Software:
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