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Download Opera browser with:
As suggested:
In Opera, goto the URL opera://settings/autofill. Look through the entries in there. Same thing with opera://settings/passwords.
In Opera, goto the URL opera://settings/onStartup and turn off "Ask me when Opera is started by a shortcut specifying an URL" to see if it helps.
That thread points to https://extensions.openoffice.org/en/project/czech-dictionary-pack-ceske-slovniky-cs-cz, but you can search the site for a Norwegian one to see if it works. https://extensions.openoffice.org/en/project/norwegian-dictionaries-spell-checker-thesaurus-and-hyphenation might be it, but didn't check.
Looking through your older posts (including the linked thread), I didn't see that you ever tried to disable hardware acceleration just to test how it behaves in Opera then. Not suggesting that as a solution, but a test. You can do this under opera://settings/system and then restart Opera. Or, you can launch Opera from the command line with the --disable-gpu switch too/instead. See https://stackoverflow.com/a/1308947/1697 if needed for doing that on Mac.
Are these still your systems?
In https://forums.opera.com/post/144494:
You need a 500+ Hz mouse
What mouse do you have btw?
and the desktop should actually be running at 240 fps behind Opera
Did you mean something specific about the desktop should be running at 240 other than the monitor refresh rate being set and showing as so in the display settings for the OS?
In https://forums.opera.com/post/145408:
Yes, I've overclocked the HDMI port (headless display which is always on just for audio) going to my AV receiver to 120/144 Hz for my 240 and 144 Hz monitors respectively. I didn't have stuttering due to the mismatch
Could you expand on this? How did you overclock it?
I don't use the two monitors together, but only either one monitor and the AVR.
Do both HDMI connections run from the GPU through the AVR where you switch inputs on the AVR to select which monitor? If so, have you tried connecting the gpu to the monitor directly to bypass the receiver altogether? Even if other browsers work fine with it, it'd be interesting to see if makes a difference for Opera.
Is there any way you can make a high-fps video that shows the difference between Chrome and Opera for example so there's a visual of the problem?
Situation is being monitored in bug DNA-68444, but no activity in a while and still, no one has been able to reproduce the problem. 
I can confirm.
Open up a new tab.
Type g and google.com will autocomplete with oogle.com being highlighted in blue.
Press ctrl + shift + right arrow and the selection will trim down to the next word boundary so that just com is highlighted. In Opera, the shortcut doesn't do anything. (Probably because the autocompleted part isn't considered part of the text yet)
"Save as pdf" is special in that it's a picture that's as wide and as tall as the site (or the selection you've made). You can ctrl + p instead and choose "save as pdf" to print to a pdf instead. That'll paginate everything and should make the size look better.
For the non-print "Save as pdf", I'd try the pdf file that's created in a reader besides Adobe. It' has known bugs dealing with large widths and heights.
The Amazon thing is caused by Opera's built-in Amazon promotion component extension. It's intended behavior.
@jojo0587 said in Two days ago, opera 39 stopped synchronizing with my accounto o pera!:
I'm not sure if this is so but I suspect that sync was simply disabled for older versions.
I'm not sure either. However, recently there was an issue with Opera 36 and Sync and Opera fixed the issue. So, there's a chance older versions are still supported.