You can try logging to see if the log shows anything.

You can rename your profile folder to test if Opera starts then. If so, you'll know there's something wrong with your profile folder.

You can uninstall and reinstall Opera just to make sure its install folders are good.

If you're using regular Opera, it's fixed in Opera Stable 90.0.4480.80 and newer.

If you're using Opera GX, the crash bug isn't fixed yet.

@burnout426 Thank you so much.

For those that it could help, I will do a Windows system restore, the last backup of which dates back to 3 days, which will allow me to recover my Opera session from that moment.

Or, a more simple way.
After crash, after you've started Opera and encountered an empty new session, while Opera is open, do a back-up of this folder -> %AppData%\Opera Software\Opera Stable\Sessions
Then you can close Opera, rename/delete current "Sessions" folder, and replace it the one from backup. Keep the backup until you will have a recovered session. Make sure in current "Sessions" folder is only by one "Session_####" and "Tabs_####" file (the smallest one can be deleted).

Important: When you notice that your session was lost, do not start browsing in this new empty session to not overwrite your old main session. For browsing Internet use another browser, another device, or a private windows in Opera (Ctrl+Shift+N).

Version:85.0.4341.60 (x86_64)
System:macOS Version 11.6.5 (Build 20G527) 11.6.5 x86_64

Crashes instantly if I am online, if I turn wifi OFF, it's fine. All extensions are disabled.

So frustrating 😞 Being on older macOS doesn't help either.

PS: If I go offline, open a Private window, close the main and go back online. It works fine. It crashes instantly if I open a new main tab.

Me too, it started 2 days ago. My opera crashes everytime i try to pinboard any page. Good it has autosave session, so none of my tabs got lost

I had the same problem, I didn't uninstall or delete anything. Just downloaded the opera setup from the official website and installed like nothing happened. It worked, even I had my open tabs! 58e4635d-d9d7-445c-8178-29efc105521a-image.png

@sagerhoninx96 Opera GX for Mac or Windows?

Can you get Opera to crash again? If so, does it do it when clicking the key for all sites or just for a certain site? Do you have Opera Sync enabled?

@fornit
Immediately after crash, backup %Appdata%\Opera Software\Opera Stable\Sessions folder contents (there is usually two sets of Tabs and Sessions files).
If Opera starts empty then, close it, remove this folder contents and copy there oldest (or biggest, should be the same) Tabs and Sessions files pair from backup

@leocg it could run for about 5 seconds, then close.

Install SessionBuddy.

Never lose your open tabs again. I learned this lesson not to trust Opera correctly shutting down a while ago

It's a Chrome extension so you need the Opera extension that allows you to install Chrome extensions.

I recently had a problem where Opera GX had been crashing upon start-up, right after the opera start-up had played, then having it turn black and seeming to crash, not opening the app, and without an error message. I found an easy solution to the problem. It may not work for everyone, but it worked first time I tried it.

Go to the Opera GX download page (https://www.opera.com/gx) and click "Download Opera GX" Run the file downloaded (OperaGXSetup.exe) There may be a screen saying "Accept and Upgrade", click the button. If it does not appear, you should be on step 4 Select the file location for where you would like to download the new Opera GX install (example: c:\Users\test\appdata\local\programs)
That is the usual file local for the download, if it was located there originally, change the location of the download. Click download and wait for it to install. Once complete, open Opera GX and see if the problem is resolved.

I hope this resolved the problem of opera crashing when opened and after the animation, if this doesn't solve it, I am not the best with things and I might not be able to help much more.