Chrome/Firefox/Opera: Using HTTPS is essential for keeping your personal information safe, especially when browsing on public Wi-Fi. Free extension HTTPS Everywhere recently updated with thousands more rules, ensuring HTTPS is enabled on as many sites as possible.
HTTPS Everywhere, if you don't know, is a simple browser extension that automatically connects you to the HTTPS version of thousands of sites, rather than using the far less secure HTTP. The new version of the extension not only adds thousands of new rules, but also adds some automated tests to check for common errors, easier disabling (for when HTTPS Everywhere breaks functionality on a site you're visiting), and the ability to disable HTTP altogether. Obviously this would break lots of sites, but if you're doing particularly security-conscious work, it could help ensure that all of your information is protected for that session.
Check out the blog post below for more information on the update, or head straight to the download pages to try the extension. If you already use it, it should update automatically.
HTTPS Everywhere Version 5: Sixteen New Languages and Thousands of New Rules [Electronic Frontier Foundation]
HTTPS Everywhere [Chrome Web Store]
HTTPS Everywhere [Firefox Add-Ons]