When you update Firefox, it automatically checks your add-ons and updates them to compatible versions when possible. If an add-on can't be updated and is no longer compatible, Firefox turns it off. This article shows you how to update those add-ons and get them working again.
Firefox checks for new versions of your add-ons once a day and updates them automatically. You can manually check for new versions at any time.
Some add-on makers have different versions of their add-on for different versions of Firefox so updating through the Add-on Manager doesn't work. In this case, an update might be available on the add-on's website.
There may be other add-ons with similar features that are compatible with your version of Firefox. The Add-ons site is a good place to find alternatives.