A submission that clears review first time instead of bouncing on permissions.
The Chrome Web Store review criteria are documented, so rejections are predictable. Nearly all of them come down to permissions.
Broad host permissions covering all URLs invite scrutiny. Request the minimum, and expand in a later version when you can justify it.
There is a per-permission justification field. It must describe the feature that uses it, and the feature must exist in the build you submit.
1280x800 screenshots, a 440x280 tile, a 128px icon, and a privacy policy URL. The privacy policy is not optional if you touch user data.
Minified is fine, obfuscated is not. Code a reviewer cannot read is rejected on that basis alone.