PhpBB3 BBCodes

With this extension, you can do this in the ACP.
https://github.com/phpbb-extensions/custom-css

Try this :

https://www.hirensbootcd.org/download/

Make a bootable image with above mentioned Rufus. This is like a Swiss army knive.

Try this:

https://www.detectadblock.com/

Dutch translation.

I use that template extension for other stuff, going to take a look and see what I can do. I want my paying users to see nothing concerning ads or blockers.

Tested it and seems to be working just fine! Nice work man.