1. Install NoScript

2. De-select every checkbox on Embedding ... and Advanced > Trusted

3. Select: General > Scripts Globally Allowed (Dangerous)

4. Visit quora.com and using the NoScript context menu, mark as Untrusted

5. Or instead of #4, (at least in Firefox) you can access the untrusted list from: about:config > noscript.untrusted ... and then just add quora.com. I also added every news site I visit. Excepting wsj.com is removes every news site's paywall.