Use Mozilla firefox for browsing, use the adblock extension and just add this to your adblock filter:
fe.shortcuts.search.yahoo.com / script ? f r = csc_fin_pf
That is it - no more underlining, no more popups on double clicking a word etc. on yahoo finance websites.
Note: remove the spaces, yahoo won't let me post the link without spaces.

http://l.yimg.com/us.js.yimg.c…
but that also blocks yahoo news video clips.
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