At least AAK-Cont will be available for download, for those who still wish to use it (probably people on Pale Moon or Waterfox or a Firefox ESR earlier than 59, who cannot or refuse to use Firefox Quantum).

Actually...

This repository will be archived 1 month after ABR2 comes out of beta.

Right from the AdBlock Protector 2 page:

AAK-Cont, although unmaintained, will still be available for download.

@kah0922
AAK-Cont was last updated in September, it is unmaintained for a while already, I just didn't made it official.

ABR2 is ready for developer preview, as I need to inject 'unsafe-inline' for it to work properly, I'm afraid that it will conflict with uBO, and probably ABP too. I wouldn't need to do that for Quantum 58+, so I'll probably wait for it. ABR2 will be released to the extension stores sometimes next year if everything goes as planned. But my plans rarely work out so don't have too much hope.

Archived just means daily build script will be turned off, it will still be installable. Daily build task will still run for now, the only thing changed since September is that I no longer accept issues in AAK-Cont repository.

You wrote that AdBlock Protector 2 extension is not available yet. What about using in the meantime uBlock Protector Extension + uBlock Protector List for Chrome/Chromium webbrowsers ?

For Chrome/Chromium web browsers, what is the advantage for using in the future AdBlock Protector 2 extension instead of uBlock Protector Extension ?

If everything goes planned, ABR2 will work with AdBlock, Adblock Plus, and other reasonable adblockers. Also, ABR2 may be able to completely take over the task and work alone, block ads and protect itself from detection. There is no other advantage for Chrome (that are planned for now).

I need at least a network filtering engine to get a minimal prototype working, I plan on experimenting with WebAssembly to see if it will help with CPU and RAM usage, the current prototype is way too inefficient.

But all that is just plan, the future is unknown.

In other words, nothing you plan on releasing will work for non-Quantum Firefox (and Waterfox, Pale Moon, etc etc)?

ABR2 is canceled.

This has basically left people who refuse to "upgrade" to webextensions/chrome without a viable option for strong anti-adblock