Adding feed subscriber to Firefox

There is RSS button on the address bar of Firefox when a web site is providing feed. You can add any feed subscriber by doing follows:

1. Input about:config into address bar.
2. See there are some browser.contentHandlers.types.N.(title|type|uri) entries.
3. Add subscribers after them.

For example, I add Fastladder by adding these entries.

• browser.contentHandlers.types.6.title = Fastladder
• browser.contentHandlers.types.6.type = application/vnd.mozilla.maybe.feed
• browser.contentHandlers.types.6.uri = http://fastladder.com/subscribe/%s