1. Good. you do not have two similar versions of a browser from Google installed.
You can look at the Debian Bugtracking System (BTS)for Chromium and see if any bugs for the freer version are similar to your Chrome bugs, but they do differ from each other. You might have to search the web for info about Chrome and linux and bugs. Chromium was freezing up on me for a bit there, and presently I am using Firefox-esr much more. It should get better. Maybe check via htop and see if spawned processes from ad-blockers disappear when the tab for a site is closed.