Okular breaks after KDE update solution rebuild qt5-styleplugins

This is the second time Okular doesn't function after a KDE update. Solution: qt5-styleplugins has to be rebuild.
$packer -S qt5-styleplugins
Simple enough if you know what to do.
Error message was:
qt5ct: using qt5ct plugin
Cannot mix incompatible Qt library (version 0x50900) with this library (version 0x50901)
Aborted (core dumped)

Webpush notifications in firefox - howto get rid of them

Visited a site and after that I got small notifications of that site while browsing on others. Never experienced that before; no new extensions that could explain it. This is the explanation :

You can choose whether or not to give permission* for a site to send you notifications by following these instructions:

1. Click the icon to bring up the Control Center.
2. Click the menu next to Permissions and choose a notification option: Always Ask, Allow, or Block. 

*The strange thing that I never gave permission to do this on this site except for accepting cookies. 

You have to visit the site that annoys you and look at the top left next to the email address to find the I icon. Click on the I and then on the right arrow button and then on More Information at the bottom. Then you will see a few tabs and can you choose the permission tab and  change allow to block.

audacious wouldn't read my cue file

Sometimes you can be so lost with a simple problem.
What I should have done right away is look at the arch install page of Audacious-plugins There you see as optional dependencie libcue. Seem to have missed that installing audacious. so
#pacman -S libcue
ended my misery.
Ouch, all is well that ends well but  a pity for the time I lost so much time with this. Still stupid, or getting more stupid??