The announcement for Firefox 47.0 highlights a few changes: synchronized tabs (between Firefox instances), improved video playback, and some security and performance improvements for Android users.

According to the release notes, Firefox 47.0 takes a few more steps in the process of moving away from Flash and toward HTML5 for video, and removes support for some older technologies related to plugins. The click-to-activate plugin whitelist, a security feature that was introduced in 2013, has been removed.

Most importantly, Firefox 47.0 fixes at least thirteen security issues. So don’t delay, update Firefox as soon as you can.

Check your Firefox version and trigger an update by navigating to its About page:

1. Click the ‘hamburger’ (three horizontal bars) menu button at the top right.
2. Click the question mark at the bottom of the menu.
3. Click ‘About Firefox’ in the menu.