Firefox's keyboard shortcuts are worse
- Cmd+Shift+P instead of Cmd+Shift+N for new incognito window is objectively wrong and can't be fixed
- Having separate Cmd+Shift+N and Cmd+Shift+T shortcuts for open last closed window/last closed tab instead of Cmd+Shift+T doing both is also objectively worse
- I can't rebind Previous/Next tab, at least on macOS
There's less extensions because Firefox failed on the last 1% of copying Chrome's extension API. Doing it correctly would've meant it's possible to install extensions on Firefox directly from the Chrome Web Store, like you can with the Orion browser.
Mouse scroll physics are too slow on macOS. One "tick" of my scroll wheel scrolls a bit more than half of how much Chrome and Safari scroll
There is no full screen mode that hides the URL bar
Every single time you're searching something, Firefox includes a list of ads for search engines I will never use for as long as I live (Bing and DDG) under a "This time search with..." guise instead of just showing me search results. There are tons of these minor design flaws which add up to making Firefox feel like a worse browser.
Chrome is a faster browser according to every bench mark I've seen and I can feel it.
Switching would log me out of all my websites and clear all localStorage data