So... hello everyone! My problem: Cross site JavaScript links dont work anymore. So for example: I reset my password of my Mozilla account, but I can't open the link out of the email, it says "please enable JavaScript". When I take that same link and paste it in a new tab manually, it works. What I noticed also ist, in the tab that opened automatically over the clickend link, the manual pasting of the link also does not work. It only works in a "fresh" unused new tab when pasting it manually. On another website I have a link, e.g. https://website.php?information Here it also behaves that it only works if I open https://website.php manually and type in the "information" then on my own. Once I am on a website, e.g. Twitch.com JavaScript works fine. I just cant switch to a new tab over JS anymore, not cross site. I didn't change anything from the default in Firefox. I have the suspicion that I could have to do anything with the operation system Windows 10. Thank you so much for the reply!! BR Additional information: - FX Versions: same Problem with Versions of Firefox 55 & 56 stable - Extensions: No difference with or without installed extensions.