If you’re like us, it’s easy to end up with 20 Mozilla Firefox windows full of hundreds of tabs open at once. Luckily, there’s an easy way to close multiple Firefox windows at the same time. Here’s how to do it on Windows, Linux...

If you’re like us, it’s easy to end up with 20 Mozilla Firefox windows full of hundreds of tabs open at once. Luckily, there’s an easy way to close multiple Firefox windows at the same time. Here’s how to do it on Windows, Linux, and Mac.