Several factors might be causing the issue. First, cached data and cookies can sometimes interfere with website loading. Clearing Firefox's cache and cookies may resolve the problem by ensuring you're accessing the latest version of the site. Additionally, browser extensions or add-ons might be blocking or altering the way the page loads. Restarting Firefox in Safe Mode can help determine if an extension is responsible, and if so, disabling them one by one can identify the culprit.
Another possible cause is DNS prefetching, a feature that speeds up browsing but can sometimes cause loading issues. You can disable it by navigating to about:config in Firefox, searching for network.dns.disablePrefetch, and setting it to true. Sometimes, the issue is website-specific, meaning the site may have temporary technical difficulties or compatibility issues with Firefox.
As for concerns about content blocking, Firefox does not intentionally block content based on political viewpoints. The problem is more likely related to technical factors rather than any deliberate restriction.
