Firefox checks each of the extensions and add-ons for potential malware threats and performance issues. If it identifies any issued Mozilla bans the add-on and will include the add-on in a list of blocklisted add-ons.
These blocklisted add-ons that should no longer be used with Mozilla products.
The most recent addition to the Firefox addon blacklist is the Skype Toolbar Firefox extension. There are many other add-ons are already blacklisted.  Mozilla categorizes these balcklisted add-ons into two types , soft block and hard block.  If it is soft block the addon will be disabled and the user is notified of the block. It also gives the option to re-enable it if they choose.
Here is a list of add-ons which are blocklisted by Firefox. Read the complete list and description of each of the Firefox blacklisted addon .

  1. Skype Toolbar extension- All versions for Firefox.
  2. Bing Bar for Firefox.
  3. Default Manager, v2.2 for Firefox
  4. Search Helper Extension, v1.0
  5. Internet Download Manager, v2.1-3.3
  6. Free Download Manager, v1.0-1.3.1
  7. Yahoo Application State Plugin, v1.0.0.5
  8. Vietnamese Language Pack, v2.0
  9. Apple QuickTime Plugin, v7.1
  10. Crawler Toolbar, for Firefox 3.0a1 and above
  11. Daemon Tools Toolbar, versions older than 1.0.0.5
  12. AVG SafeSearch, versions older than 8.5
  13. Enigmail, versions older than 0.97a
  14. YSlow, version 2.0.5,
  15. Viewpoint Media Player,
  16. Java Deployment Toolkit
  17. Internet Download Manager, versions 6.9.8 and older

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