Firefox well known as one of browser that support more power with the form of addon. Not all of those addon functioning well and thats why regulary proggramer release update.
The update process itself is easy, you don’t have to do it yourself. Firefox will show you a popup window to do that :
1. By default tick already chosen for all addon that need update, you may remove tick to your preferred addon.
2. Install Updates, click this button will easily tell firefox to update.
3. Skip, this button will skip update process and left with old addon version.
4. Show Information, you see more information regard to each extension or addon that shown.
You might need to leave or stay update depend on your choose as some old addon reported work well and stable.
Don’t fix thing if ain’t broken right 🙂