Rated 5 out of 5 stars
There's nothing worse that middle-clicking in a text area hoping to autoscroll it and having the entire page move instead!
Thanks to White Alice0775, yet another long-time Bug has been FIXED!! (or worked around).
Hopefully your patch will be included in the Firefox sourcecode soon so that no extension install will be necessary.
I made a testcase webpage so Firefox users can see see how Firefox behaves 'before' and 'after' the install of this extension (or in another browser, such as IE, that handles autoscrolling correctly): https://bugzilla.mozilla.org/attachment.cgi?id=357319