Add-ons allow you to add extra features and functionality to Firefox. This article explains update options of addons and give links to Advanced users about debbuging add-ons.

1. Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
2. Select the Extensions panel.

Updating add-ons

1. Click the gear icon in the upper-right area of the Extensions panel.
   
2. Then choose one of the options below from opened list:

• Check for update: Means, you can check update to your add-ons as manually. If there are any update, you have an option to choose update it now or later. For this option, you should reset all add-ons to update automatically.
• View recent updates: When you click this option, it shows you last updated add-ons.
• Update Add-ons automatically: If you want to keep up to date your add-ons, you should select this option to update them automatically.
• Reset all add-ons to update automatically: If you want to update your add-ons manually, select this option. You can check for update any time as manually.

Debug add-ons (for advanced users)

1. Click the gear icon in the upper-right area of the Extensions panel.
2. Then choose the Debug Add-ons from opened list.
   
3. Mark the enable add-on debugging checkbox.
4. Then click the Debug button near the extensions. You will see a incoming connection window which ask to "Allow connection".
5. Click OK. Console window will open.

Mozilla Developer Network (MDN) provides information about debugging add-ons:

• about:debugging page
• Add-on Debugger.
• WebExtensions-Debugging.