JK: Hi James. Thank you for your update.
There's a difference in how the "S" button works in Firefox and Chrome - in Firefox you get an immediate action, if you press it. In Chrome, you are always getting a menu, when the top element is your last action. This action is also available via the shortcut key combination - it might be helpful for you.
The selection extents should follow the mouse cursor - are you sure you're using the latest version of FireShot for Chrome (0.98.90) ?
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