I've read through quite a few posts on this error. Disabled the only extension, and followed guidlines on how to disable tracking protection. I still get the error message. [quote]Firefox Can’t Open This Page To protect your security, vimeo.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window. Learn more… Report errors like this to help Mozilla identify and block malicious sites[/quote] Have tried the 'Open site in new window', it goes to a Vimeo video and then an error message .. [quote]Sorry, we couldn’t find that page Make sure you’ve typed the URL correctly, or try searching Vimeo. You could also watch one of the videos below instead.[/quote] Even though when I hover the mouse over the 'shield' and the display is "Enhanced tracking protection is off for this site", the error still comes up. I go into settings and the 'Managed Exceptions' shows no entries. Shouldn't there be an exception in there for the site I am attempting to view a video from ? There is no method to add a site manually. Firefox 101.0.1 (64-bit) on Kubuntu (linux)