New chrome extension on github?

Is there anyway to contribute to the new extension? There’s only the older version on GitHub.
There are some things that bug (heh) me which I want to find a fix.

As the add-on isn’t Open Source due to the heavy investments, code contributions are not really possible for now. But high quality bug reports are a very valuable contribution, too. Or any form of testing. If you have specific ideas, let us know.