Known Websites issues - rmottola/Arctic-Fox GitHub Wiki

Dicourse

Discourse based forums require too current browser support, no work around known.

YouTube

YouTube User Agent is shipped to serve the mobile version, which is more light-weight. A simple URL trick to get the desktop version, or a YT setting or similar is not known. To force the desktop version (which mostly works for playback) force in about:config the user agent string general.useragent.override.youtube.com to e.g. Mozilla/5.0 (X11; Linux x86_64; rv:48.0) Gecko/20010101 Goanna/43.0 Firefox/48.0 ArcticFox/43.0 Apparently YouTube disabled the mobile version, workaround no longer reliably works.

CloudFlare

CloudFlare tests do not pass, nor do they pass on Firefox ESR78 or SeaMonkey/2.53.20! Safari 11 however passes, even if it is very ancient. Either some explicit problem with Gecko tests or WebKit was very advanced. Information needed, check for specific mozilla patch for Firefox and first version where it works would be of use.