Hello Debarkader, thank you.

- Indeed on file URL's, this is a security protection of FF = add-ons are not allowed to access / trigger "file:..." URL's (as well as "about:..." URL's). This is understandable, as it would allow an add-on to access files on your system ... This results in an "Error: Illegal URL" exception in the browser console log and nothing can happen.

- On the middle-mouse-button click and autoscrolling, I know the problem on Windows and I was not able until now to prevent this default FF behavior. However, I did one more attempt at it, and good news, it seems I eventually succeeded this time to find a way to prevent it .. => that will be in 2.0.41.

AaFn.
=============== Update ==============
This is now in 2.0.41.
AaFn.