From Ryan Brown, posted by BerserkerDog on Reddit.

Today, Waterfox turns 15 years old.
The post celebrating the anniversary makes an interesting and important announcement: Waterfox will be switching from uBlock Origin to using Brave's adblock library.

This means Waterfox's content filtering will be done by the browser, rather than a browser extension. The announcement cites performance and uBlock Origin's problematic GPL license (which is incompatible with Waterfox's MPL license) as major reasons for the change.

There is one notable, and in my opinion somewhat concerning, note in the article: the adblocker will be disabled by default on whatever Waterfox's search partner is (currently Startpage). This is especially problematic as search ads are a common vector for malware.

https://www.waterfox.com/blog/15-years-of-forking/

Correction: I initially stated it was unclear if Waterfox allowed users to reenable the adblocker on Startpage. That was completely false. The article itself says users will have the option to reenable it.
Thanks to @iyashikei_kris for pointing this out

#Waterfox #WaterfoxBrowser

15 Years of Forking - Waterfox Blog

Today marks 15 years of Waterfox!

Waterfox

@iampytest1

>Its not clear if users will have the ability to re-enable it

Not sure if the article got updated since when you looked at it, but that's clarified here:

"text ads will remain visible on our default search partner’s page - currently Startpage - mirroring the approach Brave takes with their search partner. This is what keeps the lights on. Users who want to disable that entirely can do so with a single toggle in settings"

@iyashikei_kris Thanks for pointing that out. I didn't see that in the article.
Sorry for misrepresenting it.