If you use Chromium then you'll be using an open-source browser. Chrome gets the bulk of its source code from Chromium, but there are some parts they can't include in the open-source distribution due to licensing restrictions.
However, that's a compromise, and it would be much nicer if it were open-source from the start.
However, that's a compromise, and it would be much nicer if it were open-source from the start.