@leocg thank you. Not a place I would normally go!

@leocg where do I find it? I've checked the online resources and found nothing called "task manager".

For the past few weeks, Opera has been excrutiatingly slow, and the speed dial page shows the name on the tab but fails to load -- all I see is a white screen. While working in other tabs, I have had multiple crashes "ceased working due to a problem" or "out of memory" and have had some difficulty reloading the page, or else it crashes again right away. Opera also seems to be using an inordinate amount of memory, like about 50% of my 8 GB. Is there a fix for this?

@leocg I finally located the option for pdf files, after a long search. It was definitely an Opera-specific thing. Fixed now, thanks. Opera hides a lot of stuff, I've found.

Error message:
This site can’t provide a secure connection
lending6.us.archive.org sent an invalid response.

Is there a way I can get this to do what it used to and open a dialogue with Adobe Digital Editions? Or even open the pdf in another window?

I use HTTPSeverywhere, could this be an issue?