Some developers have created add-ons that let you check whether a web server has a Heartbleed vulnerability or not. However, I don't know whether they work on mobile. Can you check your most important sites on a desktop browser? * [https://support.mozilla.org/questions/994421 Does Mozilla have a plugin similar to the Chrome browser plugin that will alert users when they visit a website that is still vulnerable to Heartbleed?]

Note Firefox for Android itself is not subject to the Heartbleed bug.