I just noticed there is a problem when rendering sliced sprites with Firefox.
Steps to reproduce the problem:
- Create a new project with Cocos Creator
- Add a button to the canvas, with all default settings, and put it in the visible area of the canvas
- Click Play button on Cocos Creator to view the result in the default web browser
With Firefox (latest current version - 45.0.1 - on Mac OS X) you got this:

(notice the black lines at location of ‘slicing lines’
With Cocos Creator internal viewer, or Safari or Chrome, no problem.
I tried the UIButton example in Cocos2d-HTML5 3.10 Test Cases, and all is correctly displayed on Firefox, so I guess this is something related to cocos2d-js version currently used with Cocos Creator.
–
Daniel