Short answer: yes.
Here are some web platform features Chrome and Safari (desktop and mobile) are shipping but not Firefox:
* Container Style queries: https://web-platform-dx.github.io/web-features-explorer/feat...
* @scope: https://web-platform-dx.github.io/web-features-explorer/feat...
* Picture in Picture: https://web-platform-dx.github.io/web-features-explorer/feat...
* View Transitions: https://web-platform-dx.github.io/web-features-explorer/feat...
* Cross-document view transitions: https://web-platform-dx.github.io/web-features-explorer/feat...
Is this not PiP?
[1]: https://caniuse.com/picture-in-picture
Short answer: yes.
Here are some web platform features Chrome and Safari (desktop and mobile) are shipping but not Firefox:
* Container Style queries: https://web-platform-dx.github.io/web-features-explorer/feat...
* @scope: https://web-platform-dx.github.io/web-features-explorer/feat...
* Picture in Picture: https://web-platform-dx.github.io/web-features-explorer/feat...
* View Transitions: https://web-platform-dx.github.io/web-features-explorer/feat...
* Cross-document view transitions: https://web-platform-dx.github.io/web-features-explorer/feat...