Look for Midnight Lizard at Chrome Store.

Won't work at AddOns.Opera.Com.
Edit its settings to allow on Search sites and localhost.

For the white blink at first loading in some pages, noting found, but many builds ago didn't happen.

"Off topic Tip"
Follow the Signature's BackUp | Reset link.
Take the opportunity to start a Backup plan, even create a Template Profile.

SyncBack | Synkron helps.

Windows 7 (x64)
Opera Test profile | Opera Back up | Reset