Chromebleed Chrome Browser Plugin Will Safeguard You Against Heartbleed Exploit
Chromebleed is an extension for Google's Chrome browser. It uses a web service developed by Filippo Valsorda to check the URL of a page you just loaded. If the page is affected by Heartbleed, a Chrome notification will appear and you'll know not to enter any personal information.
Image Source: Flickr (snoopsmaus)
It's a simple solution to a pretty serious problem, though be advised that it can create false positives. If you don't trust the result but want to play it safe, we suggest getting in touch with the website owner or site admin to find out if (A) they're aware of Heartbleed and (B) if they've taken care of the situation by patching OpenSSH.
You can download Chromebleed here. Alternately, you can bookmark Filippo Valsorda's Heartbleed Test page to manually check individual websites for the vulnerability. And for those wondering, you're safe to enter your login credentials at HotHardware.