If Firefox was a better funded and more competent alternative to Chrome we wouldn’t even have this whole Manifest v3 mess since Chrome would just lose all their users.
I don’t think that’s an issue of competency - which I understand as functionality/feature parity in this wording.
Chrome gained and became this popular likely entirely due to Marketing and big-corp ecosystem network effect through pushing it - through Google, Google Docs, and related Alphabet services.
I don’t think Firefox was every really inferior. I’ve always preferred the dev tools and a few other things over Chrome. There was merely a time where performance was worse, but that likely only mattered in benchmarks - and marketing.
I recently had to learn about that, targeting PWA. :(
When I read “you can install an extension for it” I thought that would be simple enough. But that extension then requires an additional Firefox installation which causes it’s own share of problems. (Comparatively complicated setup process despite simple walkthrough wizard with installer integration, program shortcuts being added, Firefox onboarding being triggered in the PWA.)