As a side note, I’ve recently found Opera (9.x versions) using about 80% – 100% CPU when browsing Javascript intensive sites; mainly GMail and Facebook. It seems that others are having similar issues. GMail seems to be fixed by using the opposite of the advice given here, i.e. do an F12, then “Edit Site Preferences” -> “Network” Tab -> Change the Browser Identification “Opera”. This could be a fluke, but it seems to have fixed things in GMail at least.
ALLICIENT INFORMATION SECURITY
Peter Maxwell's Information Security Site
I’ve had 100% CPU utilization in Gmail for a while. Changing the identification didn’t work, but the problem happened to be within the ~/.opera/browser.js file, which was trying to modify Gmail scripts. Tools -> Advanced -> Error console told me something like “Gmail deletes messages on pressing the End key”. So I’ve just deleted the file and it helped.
I’m using Opera 9.60 in Linux, but maybe this would also work in your OS and version.
PS: you have an error in this form, “This reCAPTCHA key isn’t authorized for the given domain.”