I have a vendetta against Chromium because of Valve having to cease support for older OSes. They did that because of Chromium being built into the Steam client.
Firefox 115 is the last version to support Windows 7, so Valve using Gecko instead of Blink wouldn't have made a difference here. Maybe it's time to move on from a 14 year old operating system on the internet with known zero-day exploits that aren't going to get patched.