Hi TarenC, SharePoint Online is based on Office Online and SharePoint site. All these three browsers are supported for the site. Regarding Office online, Chrome is the best browser among these three. You can check this for details. Generally, most SharePoint Online features are supported in the latest versions of Chrome, Firefox and Safari. One limitation that I should mention is that the feature is only available for Microsoft Internet Explorer. Here is another for your reference.
Omni MAC browser is one of the best browser for MAC in 2017. It offers plenty of awesome features that are not offered by other web browsers. It offers plenty of awesome features that are not offered by other web browsers. Camino, Firefox, Flock and Opera all perform well on Mac machines, but overall the best browser for Mac and IOS users is Safari. Again, it's all about user preference. Try them and see which you prefer.
![Best Best](http://www.spicytricks.com/wp-content/uploads/2016/11/www-desktop-browser-share-2016.jpeg)
![Mac Mac](/uploads/1/2/5/5/125500843/590689785.png)
Regards, William.