no extensions?

I would like start a download in an external download manager.
I don't find an extension like that https://flashgot.net/
Can you help me, please?
thanks

with the new update 45.0.2552.635 (PGO) is possible!
WOW

http://i.imgur.com/n3ccs3b.png
the browser tabs are down from the "menù" in not-full screen

Can I get the menù and the tabs in the same line also in windowed?
(like full screen: http://i.imgur.com/D08hIwE.png)

thank you
it's a little bit difficult, but better than nothing.

which key words I can search in Opera addons?
any suggestion?

Is possible to move icons order (extensions) in the toolbar?
If I click and drag&drop, nothing happening.