Downgrading an Internet browser
Prior to that . . . Windows OS users should be maintaining:
(1) Routine backups of the Windows Registry, and naming the backups, to include date and time of their creation.
(2) Specific backups of items in the Windows Registry, that are tied to items in the BraveSoftware folder:
C:\Users\username\AppData\Local\BraveSoftware
and naming the specific Registry item backups, to include date and time of their creation. Probably, there will be a lot of searching around on the Internet, in order to discover just exactly what are the “specific Registry items” to back up (or keep a written record of them).
(3) Routine System Restore Points, and include in their names, date and time of their creation.
(4) Routine backups of the BraveSoftware folder:
C:\Users\username\AppData\Local\BraveSoftware
and naming the backups, to include date and time of their creation.
(5) Operate a password manager/wallet (in-addition-to/other-than what an Internet browser has), for saving your username and password combinations.
(6) Manually backup the Bookmarks.
(7) Routine backups of your important data, from whatever are the directories where such data resides; again, naming the backups, to include date and time.
In order for your chances of finding what you need - from your collections of the above - to match at a point of time, in the past.
(8) Maintain a directory that contains installers of older versions of the Internet browser.
(9) There is also, the more broad backup of the Windows installation:
https://www.windowscentral.com/how-make-full-backup-windows-10
Be prepared.
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Given, that the other side of the hazard, is the considerable amount of Security Updates (CVE, etc) involved within Chromium.
CVE:
https://chromereleases.googleblog.com/search/label/Stable%20updates+Desktop%20Update
Not to mention, the many hundreds of [Blink and] Chromium issues that need fixing, and then the same for Brave Browser.
Blink (I had not heard of it, until about 4 days ago):
https://www.chromium.org/blink/getting-started-with-blink-debugging/
https://www.chromium.org/developers/design-documents/oop-iframes/oop-iframes-rendering/
https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink>Fonts
Issue 1184110: Missing glyphs in SNAP installation of Chromium:
https://bugs.chromium.org/p/chromium/issues/detail?id=1184110&q=component%3ABlink>Fonts
Issue 1267606: Arial font not rendered properly (hyphen, dash character renders as “box”)
https://bugs.chromium.org/p/chromium/issues/detail?id=1267606
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The CHANGELOG for Brave Browser, for Android, Linux OS, Mac OS, Windows OS; shows a list of the stable releases, including many notes:
https://github.com/brave/brave-browser/blob/master/CHANGELOG_DESKTOP.md