Use another extension as the New Tab

This extension takes over the browser's new tab page, and do some tricks to ensure that current keyboard focus is in the page (not the default omnibox) on Chrome. So you may need to change the option "New tab URL" to empower your preferred extension. And here's a (maybe easy) solution:

1. open chrome://extension, disable Vimium++, and enable your preferred newtab extension.
2. open a new tab (Ctrl+T or click the button in the browser tab bar)
3. click the browser menu button, go to "More tools", and click and open "Developer Tools"
4. click the "Console" tab pannel, input location.href
5. you'll get a URL of chrome-extension://<extension-id>/... (e.g. chrome-extension://hdnehngglnbnehkfcidabjckinphnief/index.html), and copy it
6. re-enable Vimium++ and open its options page
7. paste the URL into the input area of "New tab URL", and save changes.

Then, the two extensions should coexist happily.