Both.

"We will continue to support Manifest v2 to the extent that we can"

"Brave's adblocker (Brave Shields) is not an extension, and is natively implemented. So, it will be totally unaffected."

Source: https://www.reddit.com/r/brave_browser/comments/rdab12/how_w...

Brave has committed to retaining support for all of the APIs that were removed by Manifest v3 https://github.com/brave/brave-browser/issues/20059#issuecom... (There are other mentions in the wiki and other places)

Brave's adblocker is internal and written in Rust.

https://github.com/brave/adblock-rust

I'm pretty sure it's also faster than any adblock extension like uBlock.

Brendan Eich has committed to supporting the Manifest V2 version of uBlock Origin in Brave [1].

Brave's built-in native adblocker also definitely won't be affected, as it doesn't use any webextension APIs at all.

[1]: https://github.com/uBlockOrigin/uAssets/discussions/14544#di...