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and AdBlock (sorry webmasters) which I know is available for at least Chrome, Firefox and Opera. At the very least, that should reduce the number of 'trackers' you encounter.
I'm personally more concerned about Opera moving from Presto to Blink. While my understanding of the situation is very limited, what I gather is that Opera will be using the same rendering engine as Chrome... Which many consider to pander to poor web standards, which leads to worse and worse code proliferating - because the browsers 'fix' it for them -, and then every other browser having to add a bunch of extra code to 'cater' for sloppily coded websites. The web, on the whole, becomes less efficient, and everybody loses. I see people grumbling vaguely about it in the comments on Opera's development blog, whenever I bother to read it.