Technically, both Chrome and Firefox are adware too, since Google's main business is ads, and Firefox/Mozilla get a lot of money from Google to display Google as a search engine in Firefox (an ad :) )
Firefox doesn't sell BATs, in-browser notification ads, or new tab takeovers. The closest you can get is a pinned site in the new tab page (new installs only) and ads in Pocket, or whatever they're calling that new tab thing these days.
Calling Firefox adware is a stretch at best, and disingenuous at worst. Adware doesn't mean that the software survives because of one advertisement that that user can turn off.
Looks like I'm getting a ProtonMail ad every few new tabs. I never noticed because I've never looked at the new tab page. Doesn't noticeably slow it down to have the ad there, luckily.
I love how quickly the goalpost moves from "No ads" to "Only opt in ads" to "Ads can be disabled with two clicks."
Quit coping and just admit it, Brave is adware. If you like it, that's cool, totally your choice. It's fast, performant adware. But it's adware all the same.
When we're talking about reasons to switch browsers, then saying they both have the same behavior is not whataboutism. It's extremely important context to the complaint.
It's good enough when some terrible lazy web designer only tested on Chrome. It does nothing to protect against the future when Google decides they are sick of people trying to get around their Ad Block ban and change the license because no one has any real alternatives anymore.
Also blocking is not as good as intentionally poisoning with something like Ad Nauseum
No Chromium fork developer not called Microsoft have the resources to maintain a web browser engine.
But focus on the license overlooks a more important threat. Google made Web Environment Integrity so services could require approved devices, operating systems, and browsers. Resistance led Google to remove it from desktop for now. But they kept something like it in Android. And they will try again.