Not entirely sure what you want to do here... ie; for google search you can just add '-site:quora.com' to the end of the query string and job done (I think the imacros extension can automate this)
I kinda depends on what app/software you're using that quora pops up in...ie; if in a browser env. running UBO you could treat quora.com as an ad site and block it with your own filter...(and it depends on what, from quora, that's giving you the shits =)
If you're speaking specifically mobilephone use, it really does depend on the app (they may've sold slots to quora to support their app)
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