I recently switched back to Firefox, too, after almost 6 years with Chrome. In that time it felt like the two browsers switched roles, and now Firefox is lightweight and privacy minded, while Chrome is bloated and invasive.

I recently launched Chrome to see if an issue a website I was visiting was experiencing was Firefox specific (they weren't), and I was really taken back by how old Chrome felt†. It lacked the "crisp" feeling Firefox has††, and the UI (new tab screen especially) just felt stale. It was actually really surprising.

† I was updated to the current version.

†† I understand how caching works.