Currently, the manifest for Android Chrome has density field values as string (eg. "0.75"). However, they should be numbers (eg. 0.75), see http://www.w3.org/2008/webapps/manifest/
Two steps to implement this:
Apparently, Chrome explicitly rejects the quotes (observed in the dev console). So first step "make sure it's the right thing to do" is validated.
In Android manifest file, density is now a genuine number (no more qu…
…otes), see RealFaviconGenerator/realfavicongenerator#141
Done. It will be part of v0.11 (see http://realfavicongenerator.net/change_log).
That was released on 2015/12/03 as part of v0.12, see http://realfavicongenerator.net/change_log