There are plenty of good reasons to update Firefox to the latest version. Most often, especially in my area of expertise, updating Firefox is a good thing to try when the browser isn't working correctly.
Another reason to update Firefox, one that often goes unappreciated, is that hundreds of bugs are fixed with each release, preventing problems so you never have to experience them in the first place.
Regardless of why, it's easy to update Firefox to the latest version.
"How Do I Update Firefox?"
You can update Firefox by downloading and installing the latest version from Mozilla.
The latest version of Firefox is Firefox 31. You can download Firefox 31 from Mozilla here.
Check out the Firefox 31.0 Release Notes for a complete overview of what you're getting in this new version.
Tip: Depending on how you have Firefox configured, updating may be completely automatic, meaning you don't need to manually download and install each update. You can check your update settings from Options -> Advanced -> Update in Firefox.
Other Versions of Firefox
Firefox is available for Windows, Mac, and Linux, and in many languages. You can see all of these downloads on one page on Mozilla's site here.
Firefox is also available for Android devices via the Google Play store.
Pre-release versions of Firefox are also available for download. You can find them on Mozilla's Firefox Releases page.
Important: A number of "download sites" offer the latest version of Firefox, but some of them bundle additional, probably unwanted, software with their download of the browser. Save yourself a lot of trouble down the road and stick Mozilla's site for downloading Firefox.
Having trouble updating Firefox?
See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Be sure to let me know what version of Firefox you're using (or trying to update or install), your version of Windows or other operating system you're using, any errors you're receiving, what steps you've already taken to try to fix the problem, etc.