Firefox: disable flash

Flash videos on the web pages can sometimes crash the Firefox. I am using Firefox on Mac OS. So I want to disable the flash videos in Firefox. The following to addons can be installed for that purpose:

• Flashblock:
  A Firefox addon, which can disable flash on the web page (you can still play the video by manually start it). It allows white-lists.
• NoScript:
  A Firefox addon, which lets you disable scripts, Flash and other plugins and supports a white-listing. I am currently using Flashblock, because I found NoScript is a bit complicated to manage and I do not want to block anything else other than flash.