16 gigs of RAM here. I regularly keep Opera running for days, even weeks, and have had upwards of 400 tabs going at once and never gotten such an error.

In previous versions of Opera I could drag a tab from one window to another. This only seemed to work if it was the last tab in a window though. If there were two tabs in the window I was unable to move focus from the source window to any others. If it was the last tab though the source window would disappear as I dragged the tab out of the tab bar and it would allow me to drop it into the window below. Now though even that functionality has failed. I can drag the tab and the window disappears but if I try to drop it into a new window it ends up just recreating the previous window. Is there anything I can do to restore this or am I stuck?

Try this extension, it allows you to change stuff like that:

https://addons.opera.com/en/extensions/details/new-tab-start-page-pro/?display=en

Nah, it was just a change from what i was used to. In all honesty I didn't use the feature that much as theres no way to switch between windows (that I know of) that works when you have a tab dragged around by your mouse pointer. Since I use Opera with the window maximized that meant I rarely had opportunity to use it.

As for your performance issues, have you tried delete your session files in your profile folder? It seems to help a lot of people with unexplained performance problems with Opera.

No developers here mate. Just other users. Your best bet is to post in the comments of the Opera blog after they put out a new release.

Defragging the HD could help. Whenever you get in the market for a new/upgrade for your PC I cannot recommend SSDs more highly.

Mr. Lando242 with your 1013 posts, if you have Opera with over 400 tabs open and everything is running for weeks then you're a ....

Mad or jealous, I can't decide which...

Opera does not sync extensions. The guy who started this thread misread the documentation or something.

Session Buddy is all you will ever need. Beats any built in session manager I've even see by quite a stretch.

The bookmarks file is stored in your Opera profile. you can find the profile location in the About Opera area. You can't export bookmarks to other browsers or formats in Opera natively. You can easily transfer it to other Opera install though. If you want to export it to another browser you will need an extension. There are many. My favorite is V7 Bookmarks.

Yes, you can.

This is not the suggestion box forum, try there. Also, you can load just about any extension from Chrome into Opera with the Download Chrome Extension. Try that.

Try doing a portable install of Opera on the same system. Does it also have the issue?

Also I cant download any torrent with opera , like it does not have a built in torrent client.

That would be because it does not have a built-in torrent client. The last version to have a built-in client was Opera 12. When they rebuilt the browser from scratch for Opera 15 a torrent client was not included in the rebuild. Not enough people used it.

Some machines have scaling ramped up from the factory. Especially laptops and tablets. Check you scaling settings in Windows and see what they are.

Edge and Opera use different versions of Flash. Just go to the Adobe Flash website while inside of Opera and download it. That should fix the issue.

Using a VPN and using Google is counter productive. The VPN is for enhanced privacy. If you don't want people tracking you, don't use Google.

Does it work in a private window?

Your bookmarks are stored in a file named bookmarks inside Opera's profile folder. It is generally located in C:\Users\USERNAME\AppData\Roaming\Opera Software\Opera Stable. You can confirm this by opening Opera, going to About Opera in the Opera menu, and reviewing the details in there.

I work for an IT company. We google stuff a lot. Even we get crap from google about unusual traffic because of the volume of weird searches. It is probably a similar issue.