User metude

Unfortunately, Opera AdBlock uses Opera internal filter and the current API does not allow me to add exclusions. Until Opera adds this feature, I can't offer this option. In the meantime you may right-click on the page > "edit site preferences" > "content" and uncheck "enable content blocking". These instructions have been added to version 0.28.

There is a simple UserJS for removing the target="_blank": http://userjs.org/scripts/general/enhancements/remove-blank

I have created my own script that does less than the extension you talked about. I contacted the owner of that extension to have is permission to use his script instead but as for the next version (0.26), my script will be included with the option to turn it on or off.