I use Firefox and Firefox Focus on my iPhone and have not had a problem. However, I did have a problem a couple years ago, but can't remember what Rob said to do
I think there was a setting in Firefox that needed changing, but it happened on the old TG site, not the new. Look for an update to your browser, and check their settings. Also, look for an icon in Firefox that indicates it is blocking, and click "Always Allow" if it is present.