You did not elaborate on what makes chrome a better browser, but it's safe to say a large portion see performance/speed as what makes Chrome better. However, if my assumption on your reasoning is wrong please share.
So assuming that a possible increase in privacy does not have weight on what makes a better browser, what else than performance. 2 reasons why Firefox could be better, for certain users, are: safer add-ons, and less Network use.
1) Somewhat recently it was posted to hacker news that chrome add-ons had been taken over with malware: https://news.ycombinator.com/item?id=14888010
To me, the idea that malware (adware) could be in an "app" store so obviously for such an amount of time is wholly unacceptable. The Chrome addon still contained malicious code long after that post. Forgive me, I am on mobile, so I have not researched when/if it was fixed
2) ad blockers on Firefox are simply more effective. They block the download of ads to the browser, where ad blocking on chrome uses JavaScript. This means, which is especially important on mobile, a decrease in data usage
Disclaimer: Firefox has switched a lot of things in the newest update, this may very well have changed I know they are becoming more and more like Chrome. However, that would not change the meaning of my post. I am not trying to say Firefox is a better browser, that is entirely opposite my opinion. My point is different users have different use cases, and to categorize one as objectively better is difficult to do (for such a hotly debated topic for two products of such similar quality)
It's not just one webpage - it's for an increasingly large number of websites.
And 'worse' depends a lot on use cases.
I typically have many tabs open (maybe 40+) and for my use case Firefox has always been a better browser for that.
I also get non-autoplaying videos - another thing that in my opinion makes the browser better than some alternatives, not to mention containerized browsing for better privacy.
Chrome is 'worse' for all the things I care about.
It's not a workflow issue, it's a workflow that I prefer to use (and I'm not the only one who prefers it - it's fairly common among people who still use Firefox over Chrome).
