Firefox cannot obtain cssRules solution_javascript tips

Firefox is too BT, and always adds some boring security permission settings to us. I have been discovering the FF compatibility of Qzone these days. After setting the domain, the cssRules of styleSheets cannot be obtained under FF.
Although the cssRules cannot be obtained, But I was surprised to find that I can actually insert and delete the styles in styleSheets. This is what kind of permissions, it’s boring.

It’s enough to give me insert and delete. Use these two methods You can also update the style. In order to make Firefox compatible with IE. I modified the prototype method of CSSStyleSheet