Does it work, if I specify a folder for Operas userjs and that folder contains jQuery.js? Can I then use jQuery in my own scripts?
No, don't do that. Not raw and unchecked at least.
It won't work and what you'll find is that sites that already use jQuery may take forever to load nothing but an expectant blank page.
You can try and throw a check around your
That should stop the conflict of having two jQuery libraries loaded on the one page.
No guarantees that that will work though.
Or use jQuery No Conflict