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The author works for mozilla, and firefox is a common theme on his blog. I think it's for regular readers of his blog to understand the practical impact (readers he assumes care more than average about firefox).

The tag is probably so that the post will show up in Planet Mozilla (http://planet.mozilla.org).

I often tag non-Mozilla posts as "mozilla" if they are still relevant to Planet's scope on my blog too. I've submitted a category feed instead of the full RSS blog feed so that I can exclude things which are physicsy or otherwise irrelevant.

I'd guess that because it was a bugfix by google - people might assume it was something to do with chrome or android, when it should help any webuser that talks to a linux based server, including firefox users.