Not sure what you mean - I don’t think most of the people still using Firefox are going to switch to a Chromium based browser any time soon, I can’t speak for everyone of course but it feels like Firefox users tend to have an ideological objection to Google having a monopoly on web browsers.
It’s always worth trying a different browser when you have issues on websites - there are a lot of things that can be different beyond the layout and javascript engines - cookies, configuration, addons, etc. Yesterday I noticed a big difference between Chromium and Firefox in that even if you hard-refresh on a HTTP/2 connection, Chromium reuses a kept-alive connection, and firefox doesn’t — I would totally argue that Firefox’s implementation is more correct, but Chrome’s implementation will lead to a better experience for users hard-refreshing.