Not before now — thanks for flagging! A couple questions: what do you mean by not play well? Does it undercolor (not color the text you want to have colored), overcolor (accidentally color text that should not be colored), or something else? Thanks for sharing this feedback. As another HNer pointed out via email, we need to have a contact/help link in the Settings panel so that we can gather more feedback like this.
The coloring is correct, but the chrome extension 'undoes' the equations rendered on the mathjax-enabled pages. In other words, without the beelinereader extension I can see the equations, with it I see only the latex source code. You should be able to check this on any Springer article.
OK thanks for describing this in more detail. Sounds like we just need to skip these nodes when coloring. Look out for an update in the next month or so, and in the meantime perhaps you can blacklist auto-run (via Settings) on the Springer domain.