Built in translation is a big one that I rarely see mentioned.

I was long time fan of FF while living in Ireland and the UK, but when I moved to Sweden and later Germany I was effectively forced to switch to Chrome.

Being required to interact with websites in other languages regularly meant that FF (circa 2018) was just not an option. The chrome experience for translating webpages was vastly superior to any other browser, which I needed to use 3rd party translating apps to get anywhere. These were clunky, low performance black boxes that I tried to live with and failed.

I see now that other browsers are starting to properly do built-in translation, but Chrome was way ahead for a long time. So for non-English speakers I imagine Chrome was a must use tool for a long time.