Its development is continued by volunteers in a new website requetpolicycontinued.github.io; even though there are still some compatibility issues compared to the old 0.5 version, you can downgrade at any time.
What are cross-site requests?
Cross-site requests are requests that your browser is told to make by a website you are visiting to a completely different website. Though usually legitimate requests, they often result in advertising companies and other websites knowing your browsing habits, including specific pages you view throughout the day.
Cross-site requests are also used in attacks on users who are browsing the web. Among the attacks that cross-site requests are used in, they are particularly dangerous with Cross-Site Request Forgery (CSRF) attacks where your browser is told to make a request to another website and that other website thinks you (the person) meant to make the request.
Every informations and FAQs are reported on requetpolicycontinued.github.io.
Originally, RequestPolicy extension was provided in IceCat source archive, then replaced by SpyBlock, together with Https-Everywhere and LibreJS.
IceCat 31* packaging in Fedora excludes Https-Everywhere since it’s already available separately, while new mozilla-RequestPolicy (1.0) has just been packaged and diffused by Fedora repositories.
You can install it (F20,F21,EPEL6,EPEL7) with
yum install mozilla-requestpolicy --enablerepo=updates-testing