[MacOSX] how to reset permission for Camera and Microphone in Opera

 If you don't have Opera allowed Camera permission in "Security & Privacy" settings window, run this in Terminal:

tccutil reset Camera com.operasoftware.Opera

and restart Opera

[linux] how to optimize performance with browser hardware acceleration

I had performance issues mostly because browser slowed down everything. I just enabled flags "Override software rendering list" and "GPU rasterization" in chrome://flags and work become much better. I also works on Chrome/Chromium and Opera.

Works well on MSI 2pe leopard 

[Linux] Fix opera/chrome browser video (again)

Run sudo apt-get install chromium-codecs-ffmpeg-extra 
then  sudo ln -sf /usr/lib/chromium-browser/libffmpeg.so /usr/lib/x86_64-linux-gnu/opera/libffmpeg.so
runs on opera 57

[Ubuntu] chrome/opera video not working

If your video not working in Facebook/VK, run sudo apt-get install chromium-codecs-ffmpeg-extra
It not worked by default because of licence restrictions.

Fedora - how to increase browser scroll speed

To increase mouse wheel speed, just install rpm binary package from https://fedora.pkgs.org/28/russian-fedora-free-i386/imwheel-1.0.0-0.1.pre12.fc28.i686.rpm.html . After installing, you will feel that scroll speed increased. Do not forget add it to autostart

Do not show window title in Opera and KDE

When you want to quickly switch between Opera tabs, you need to remove common window borders.

1. go to the System Settings > Window Management > tab Window rules, press New... 
2. press on Detect Window Properties and click and drag on Opera window
3. in new window press Ok
4. in tab Appearance & Fixes add tick on No titlebar and frame, in dropdown list select Apply initially, and select Yes
5. in previous tab enter own name of rule
6. Don't forget to press Ok and in Window Rules press Apply on bottom