I voted with you, though it doesn't matter a lot to me. I run a lot of browsers for different purposes.
These work well for me in Manjaro OpenRC:
FirefoxESR, PaleMoon, Seamonkey, LightFirefox, Abrowser, Cyberfox, Icecat, and Tor. (It will be interesting to see how many of these break if your dire prediction comes true).
Chromium, Qupzilla, Vivaldi. Otter ... is okay. Iridium, when I finally got it working, caused some pretty terrible freezes.