1. It uses Google DNS internally, bypassing system DNS.
2. First-run analytics to Google, new tab page analytics to Google.
3. Various built-in google services that phone home: Google Host Detector, Google URL Tracker, Google Cloud Messaging, Google Hotwording, Google Safe Browsing, WiveDine DRM, Google AutoFill, etc.
4. Update checks for all these components (the browser does not have update, but the rest does).
5. Countless accesses to Google, such as geo-location to find nearest Google server, ping probes for connectivity, etc. For a list of domains that are accessed by Chromium, see this regex used by the ungoogled-chromium project: https://github.com/Eloston/ungoogled-chromium/blob/30969fddf...
I see no problem with neither Chrome nor Firefox defaulting to Google search and suggestions, as that is easily configurable for normal users. All of the above, however, is not.
> and uses Google search suggestions (so sends all typed in text to Google)
This is not true. Firefox explicitly asks you the first time you start typing a search in the location bar whether to allow search suggestions. It is opt-in.
Firefox also allows you to keep the location/search bar separate so that you can have search suggestions without sending every URL you type to Google.
The Newtab adverts are not served by Google IIRC and they are only matched with you data locally in your browser, you get a lot of them from Mozilla and locally on your machine they get targeted so you aren't tracked online (If my memory of the article on it is correct)
I find it very disturbing that the very dangerous issue with Chrome and its family is not discussed here, which is the erosion of web standards.
tl;dr : Choosing anything based on Chromium is giving the death sentence to the Web "democracy"
Moving to a Chromium based browser is letting more and more market share to a browser engine whose roadmap is fully determined by Google. The issue trackers of Chromium or Android projects clearly shows how much Google values its users'feedback about their most wanted features : Not At All.
These days it seems they are starting to feel the same about open standards... At first with WHATWG getting in the yard of W3C they tried to get more influence on the redaction of standards, now they don't even bother since they can force anything they want in a "de facto standard" as they are doing with AMP.
The next step is to obliterate any standardized feature they don't like. It can seems to be a frivolous issue but they are doing this right now to SVG-in-OpenType, a standard that is currently implemented in all major browsers except Chromium family (yes even Edge see https://www.colorfonts.wtf/#section4 but the switch to Chromium will probably end it). Here is what Google responds to the numerous people aking them to implement it : https://bugs.chromium.org/p/chromium/issues/detail?id=306078...
Apparently a feature even the -probably small- team of Edge developers managed to implement is too complicated for Google chrome engineers ?!?
This will get more and more frequent as long they have more than 80% of browser marketshares.
So if you switch to ANY Chromium based browser, even if it's for privacy reasons, PLEASE keep in mind that you are working for the destruction of the web "democracy".
It is disheartening how we seem to learn so little from history, even recent one. It seems like yesterday that the web managed to come out from under the stranglehold of IE and now the wheel turns yet again. This time it may be even harder to break the monopoly since billions of ordinary web surfers have little to no idea of these issues and default to Chrome because it is pre-installed and has almost become synonymous for a browser.