At least for me, Chrome was always faster than Firefox, though this always came at a substantial cost in RAM demands among other computer resources. This difference in speed has only become more and more apparent over the years as more and more websites have gotten bloated with reams of JavaShit and HTML5 nonsense.
I'm also of the impression that Mozilla and Google's respective marketing ultimately had a very minor impact on overall adoption. The key driver behind Firefox and subsequently Chrome's mainstream adoption was initial uptake by power users who then spread it to the commons by word of mouth. The latter is arguably still ongoing, seeing as OS-default browsers like Edge (let alone third-party browsers like Firefox) still can't even hope to compete with Chrome.
I'm also of the impression that Mozilla and Google's respective marketing ultimately had a very minor impact on overall adoption. The key driver behind Firefox and subsequently Chrome's mainstream adoption was initial uptake by power users who then spread it to the commons by word of mouth. The latter is arguably still ongoing, seeing as OS-default browsers like Edge (let alone third-party browsers like Firefox) still can't even hope to compete with Chrome.