Firefox: notification does not have a 'close' button

[conorgil]

The browser notification in Chrome has a 'close' button that allows the user to manually dismiss the notification before it times out and the browser hides it. In Firefox, there is no 'close' button, so the user has to wait until the notification times out before it is dismissed. This is really annoying because the notification covers the top right of the window and if I want to click on another browser extension, click on a tab, etc I cannot because I accidentally click the notification and then get brought to the relevant docs.