A few days ago, on Firefox (been using for many years) middle clicking on a YouTube thumb nail video results in an "Video unavailable This content isn’t available" message. Must left click and and can only have one tab open at a time. Even when my wife emails me a link to see something on You Tube it will not open that video. This is very annoying involving copy and pasting and back tracking. Searching for a solution, I can deselect video previews in YouTube settings (which I don't need anyway), however this only works in Chrome not in Firefox which is my preferred browser. Maybe this can be corrected in either a Firefox or YouTube update. Please Help Nick Androu