The Electronic Frontier Foundation announced the availability of the HTTPS Everywhere add-in on Firefox for Android. HTTPS Everywhere helps secure communications by automatically escalating the website you are using to the https version instead of the unencrypted http traffic, where available. This can make your web traffic much more secure and less prone to prying eyes.
The installation of HTTPS Everywhere is easy. With the latest Firefox for Android installed on your Android device, just download the extension by visiting this link HTTPS Everywhere download in Firefox and approve installing it. You will now have an icon to the right of the address bar to indicate it has been installed and allow access to settings.
Apple does not allow Firefox on iOS devices. As a result, there is no HTTPS Everywhere version for iPhones or iPads.
Source: EFF