Stop Youtube videos playing automatically in Opera?

[MarcLister]

I use Opera for my browser and whenever I watch a Youtube vid I hate it when it starts to play automatically. Is there a way such as a script that would do this for me?

I checked out userstyles.org is it and found some stuff for Firefox. Would these scripts be Firefox compatible only or would they work for Opera as well?

 

[Xiy]

Tbh Try Trail and Error, Because there's no harm in trying.

 

[MarcLister]

Try the userstyles.org scripts?