Greasemonkey Scripts are the coooooolest way to customize webpages.
Firefox users can use these scripts easily by installing greasemonkey add-on. Fortunately, Opera can also run few greasemonkey scripts and here is how you can use them :
Step 1 > Set the scripts location
At the bottom of this panel, click on the choose button and browse the created folder.
Step 2> Save Desired Scripts
Now, you are ready to use greasemonkey scripts in Opera. Browse the UserScripts.org for scripts and save scripts locally in the created folder – by a right click on the install button.
Opera runs only few user scripts, so you may miss some of your favorite scripts :(