@jeffreyway It worked fine until about 20 minutes ago. Works fine in chrome.
In firefox, you don't see your avatar in the upper-right corner to access your profile. Loading a post, shows no content at all in the thread (not even original post content). Console has Error: Permission denied to access property "__rocketLoaderInlineHandlerProxy"[Learn More] rocket-loader.min.js:1:9661 on every page load.
Not sure what recently changed, but it completely broke the site.
Strange. I'm using up-to-date MacOS and FF67. I have all plugins disabled and tried in incognito mode as well. I've cleared cache, etc. Content blocking is disabled
Everything was fine. I switched tabs and was on another site, switched back and clicked All Threads. That's when it stated. Just out of the blue in the same session...
If I manually navigate to the logout url, and go to login, the css for the login page also 404's and the page is unstyled. Once logged in, css is fine but the issues I mentioned persist.
I'm on Win10 with FF66 and having the same issue as OP. Also the video's don't display or play at all. I updated FF to 67 and both issues are still there. Open in a private window and issues are still there. Works fine in Chrome.
I've tracked down the issue. If I disable the Facebook Container extension everything works as normal. Looks like they've fixed the issue, just need to wait until they do the next release.