Which color options do you miss?
There is no Chrome version. The code is almost ready, it's possible to build Chrome version from source code with minor changes but due to lack of time and interest (from me) it may take some time until port will be ready.
You can subscribe to this issue https://github.com/m-khvoinitsky/dark-background-light-text-extension/issues/99 to be notified about Chrome port progress.

UPD: if you mean url color in google search results, it's not URL, I mean, it's not html "a" tag, it's just text which has originally green color. Extension just makes it lighter to make it readable on dark background.