I did restart with addons disabled, deleted all cache folders, tried release and beta channels, deleted everything from Storage under Developer Tools, etc.
Twitter loads fine on any other browser, IE/Edge/Chrome, but it won’t load on Firefox or Firefox Developer Edition.
It loads the site, it just seems like it’s not loading the CSS, but in the dev tools you can see CSS files loaded.
Console reports one error that is not reported on Chrome.
Content Security Policy: The page’s settings blocked the loading of a resource at inline (“script-src”). twitter.com:1:1
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