Can I stop browser extensions from overriding my site's css?

I'm currently playing around with a personal website. However I noticed that the glyphs on the site, for which I have a dedicated font, weren't showing properly on Chrome. I quickly found that an extension, Chromoji, was injecting css rules that were replacing my glyphs with a sprite.

Is there a tag or something I can add to my site to stop style injection? Or a way to make my styles take precedent?