Chromium should be OK if you use either the Ungoogled-Chromium build or Iridium Browser. Both of these aim to clean up all dependencies on Google services from vanilla Chromium.

I used these and I think they are OK, but I'd still just go with Firefox as the simplest solution, particularly if you want to convince others (particularly those close to you) whether to switch browsers.

I dealt with multi-containers, didn't like it, and then I found this: https://addons.mozilla.org/en-US/firefox/addon/profile-switc.... There is no reason to go back to Chrom(e|ium) with this.