Browser Compatibility

Hey, great plugin!

I have all the latest browser versions and can only see the plugin on Chrome. Is this not compatible with Firefox and Safari? (Using a Mac, haven’t checked Windows).

Also, I adjusted the .css and replaced the #999 with my color, I have to go through those steps in the FAQ to change this small thing?

Thanks in advance,
sbo

https://www.ads-software.com/plugins/wp-single-post-navigation/