I would favour an AMD Ryzen 7000 based laptop. Much better battery life than Intel and better graphics performance.
Lenovo ThinkPad T and P series are excellent build quality.
Asus Zenbooks or Expertbooks with OLED screens are also excellent. Displays are on par, or superior to Macbooks. Excellent colour accuracy.
Make sure you get something with at least 16GB of Ram, or 32GB if available.
Not strictly true. Firefox gets inferior support from cloud services, like Microsoft. Newer versions of their Web apps are not available on Firefox.
But there should be no downside. It’s all artificial.