[TingPing]

Yes it lets you do it. It doesn’t work.

https://browser.kagi.com/WebExtensions-API-Support.html

The webRequest API is key, dns is used, maybe a few more.

Looks like the macOS support has improved but iOS may never happen.

[freediver]

uBO is supported on Orion MacOS. On iOS it still depends on Apple.

[TingPing]

Apple open sourced their WebExtension implementation, they seem open to contributions. I worry Orion doesn’t want to contribute upstream though.