Brave, Vivaldi, Edge and other chromium browsers are forks of the main chromium project. They can decide whether to include or exclude features from mainstream chromium.
As far as I know, Brave and Vivaldi will keep Manifest V2 extension support and said that they will not ship WEI (Web Environment Integrity).
Discord uses a modified version of electron, and it's also probably an outdated fork as well, although I am not sure about that.
Steam, in the other hand, uses CEF, which they use as a way to render it's interface and as a replacement of VGUI (a good example of this is the steam game overlay), I don't know if they will ship WEI if it ever releases in chromium as there isn't a statement from Valve yet.
Brave has an entire contingent of the FOSS community up in arms. They claim that it is doing more data harvesting than Alphabet, and the EULA prevents anyone from finding out what they are doing with all that data scraping.
I don't have a dog in the fight, other than as a windows user I would like to see FOSS adopted as quickly as possible since they have predicted all this shit for the last 30 years at least.
ETA: I know basically nothing about Vivaldi, though having used it, it seems to function as lightweight as chromium did back in the day. I have no comments on Edge.
Only if you want it (yes you still need to download a larger package).
Vivaldi is created by the former creator of Opera, with sort of the same goals it used to have: care for the power user. They are up for adding any customization and power user tool if people want it. It has never tried to be as lightweight as possible. Instead, it should be one of the most customizable and feature rich browsers out there.
It’s great, as I can add and remove features so it’s tailored to me.
Just to add the missing comment about Edge - MS is turning into the Microsoft version of Chrome. They removed Google's ad bs and replaced it with their own ad and monetization bs.
@DogMuffins@amycatgirl, it is not so simple, there are a huge number of third-party pages that also depend on certain Google services, directly or indirectly. This is what happens when you depend on sponsors, because with this you lose your freedom of decision, especially if you make a pact with the devil, sorry, Google.
Mozilla has already suffered this in its own flesh, becoming a Google mascot from an independent platform, even with Google devs working on Firefox.
Discord's electron still hasn't received the patch for spectre/meltdown mitigation in the browser, I doubt they will ever have to deal with manifest V3 or WEI.
You probably missed a part where Chrome, Chromium, and CEF are practically the same thing when it comes to resource consumption. Man, I can't even make Steam consume less than 1 gb ram at any time anymore, even when minimized. CPU consumption, the amount of processes, loading times are also problematic. I wish companies would rely on a labor of programmers, not just web programmers.