I found out this week Opera supports greasemonkey scripts (from firefox) but some may need some tweaking.
http://www.opera.com/support/tutorials/userjs/examples/
Give a link if you see any neat scripts to download!...Click Here | By Cappy
At the moment there is an image vulnerability for Opera with remote code excecution. Be wary!
http://security.nnov.ru/Hnews6.html...Click Here | By Cappy