People here seem to be underestimating the advantages that Google gets just because of Chrome:
- When you sign in to Google, you sign in browser-wide. Google now gets all of your browsing data, perfect for advertising. (If you ever doubt it, go check out Google Takeout. You'll be shocked at the amount of data you see there.)
- They have special APIs and features that they get to use, and nobody else. Only because they own Chrome. [1]
- They get to move forward with enabling and pushing features that allow for more advertising: see Manifest v3, FLoC.
- Google specifically serves a worse version of Search on Firefox for Mobile. You have to get an extension to get the full experience.
This isn't an isolated attempt. You can see more of the same thing with Android.
- AOSP (the open source counterpart of Android) is now unusable. It doesn't ship with most essential apps, including a Phone app. In previous versions of Android, all of these were a part of AOSP.
- Most third party launchers/stores struggle to implement features because they are only available for Google themselves.
- The signing in with Google thing from above continues here too: you sign in to Google system-wide.
[1]: https://x.com/lcasdev/status/1810696257137959018