Hello,
I can do that, but with desktop application not chrome extension.
also note chrome extension can't access your local computer.. so if you really want to access a MT4 you have to have a VPS.
but if you don't look to use a VPS and keep things private, making desktop application is the best solution.
anyway if you don't mind please contact me to discuss more details about it, and please let me know which broker you will work with.
and for more reference about me you can have a look to my profile.
Regards,
Amr