Hi, It's been a while this little buggy behaviour appeared and I didn't take time to report it (or ask if it is normal) until now. When you open a new firefox window, the default url (for example https://www.default-url.com) is displayed and then the corresponding web page. Just after the window is opened, I used to quickly click in the url bar to enter an url (for example www.new-url.com). Before, when I was clicking in the url bar, the current (default) url was selected (highlighted), and so replaced with what I was typing. Since a while (I don't really know in which FF version it appeared), when you quickly click in the url bar after opening a new FF window, the current (default) url is selected (highlighted), but if the current page is a bit large (and thus a bit slow to be displayed), then the current url is de-selected, and the cursor is blinking before the url. And so when you type an url, the result url is a concatenation of what you are typing, and the default one (with my example : www.newurl.comhttps://www.default-url.com). This behaviour can be reproduced with https://www.qwant.com/ as default url for example.