I was in search of how to export or download my Bookmarks, that was stored in my Opera Sync Account. But some time later I found that it is unreal from my Chromebook.

The problem is that I don't have the "Bookmarks Export" function on Android and I can't install the Opera app on my Chromebook (bcs it installs the same Android version)

Maybe there is some web page where I can access my stored data online?

Okay, guys! I found this topic when I have the same problem, and that's the solution, that helped me and with chance 99% will help you too!

Problem is that we need to reinstall libffmpeg library for Opera. Users that have downloaded Opera from snap install opera doesn't have our problems.

So, the first solutions is to reinstall Opera through command bellow:
snap install opera

If not or you don't wanna use snap, just make this steps:

We need package "opera-ffmpeg-codecs" from Arch Linux's repo.

Download an archive, extract it and take file "libffmpeg.so"
Move "libffmpeg.so" file to "/usr/lib/x86_64-linux-gnu/opera/" and confirm replacement of old file version.

cd ~/Downloads
tar xf opera-ffmpeg-codecs-*.tar.xz usr/lib/opera/lib_extra/libffmpeg.so -O > libffmpeg.so
sudo mv -f libffmpeg.so /usr/lib/x86_64-linux-gnu/opera/
rm opera-ffmpeg-codecs-*.tar.xz

Archive file name will be another. Don't just copy paste this, take an attention to the commands)