I think people come down a lot harder on Firefox than they should. It's a great browser, and they do a lot for the freedom of the community and as an open source ambassador.
I feel like people generally feel that, given their prominence, they could do a lot more. This is certainly true. Their weird corporate structure, their half-baked experiments like Pocket or VPN, their Google ad money, these are all valid issues.
But do you know what else is supported by Google ad money? Chromium and every browser built on it. Do you know what has a far more corporate culture? Chrome, Edge, Safari, etc. Do you know who else had weird little money making experiments? Every other browser (Brave's Basic Attention Tokens, DDG's Privacy Pro, etc.).
Firefox makes a bigger target because of their relative popularity and long history.