It's a great browser and I've came back to it even before the changes in Quantum, because the UI is better and it's also a browser I can trust to protect my interests.
Just one thing to consider ... recently in Chrome 66 they introduced the means for cosmetic ads blocking via stylesheets that can no longer be overridden, as Google finally succumbed to demands for it. Firefox has been supporting the feature for years and is on the cutting edge in regards to protecting privacy.
For example I'm using Multi-Account Containers + Facebook Container, an add-on which sandboxes Facebook. Along with the blocking of trackers that's now built-in, Firefox is leading the offense against privacy invading web services (although granted Apple's Safari doesn't do a bad job either).
The only downside of Firefox is that Chrome's dev tools are still better, however Firefox has been improving a lot lately and I'm pretty sure they'll be on par pretty soon. After all, lets not forget that Firebug, which then inspired every other browser, was an add-on that happened for Firefox.
Oh, and I love that they are refactoring its internals via Rust. That's an awesome development.