Updating to a newer version of mac os x
Browsers and plugins are commonly exploited as a means of infecting computers, so it's critical that these programs—along with the operating systems that run them—stay up to date.
The only security-related update that Apple is continuing to release for Snow Leopard through Mavericks is the XProtect "[un]Safe Downloads List," which blocks a handful of malicious downloads (although signatures are often added too late to be of much use) and prevents Flash and Java content from running in your browser—if your plug-ins are too outdated and likely to be exploited.
I have googled this problem, but it seems to me that there is no very clear answer to this question for the latest Node JS. Because this seems to be at the top of Google when searching for how to upgrade nodejs on mac I will offer my tip for anyone coming along in the future despite its age.
Upgrading via NPM You can use the method described by @Mathias above or choose the following simpler method via the terminal. I have installed straight from the site's download link, Current Version: v0.8.14.
In this example, I’ll install PHP 7.1 as that is the latest stable version of PHP. Continue the conversation on Twitter or in a comment.
In other words, just because your Mac was compatible with El Capitan (OS X 10.11), Yosemite (10.10), Mavericks (10.9), or Mountain Lion (10.8) may not necessarily mean that you'll be able to upgrade to Sierra.And why is there no spelling check on Firefox most of the time!!!!This is a Firefox support forum, not a mac one, so we won't be able to help with the specifics of updating your mac, but Apple has a good support page set-up at to help you get from 10.7 to 10.11.Some Mac models, such as 20 i Macs, are being left behind with El Capitan as their maximum OS version.Certain older Mac models are still limited to Lion (10.7), which has not been getting security patches since Yosemite was released two years ago.