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How to Install Old Firefox Add-Ons in Mozilla Firefox 4 (Install Add-Ons Which are not compatible)

Mozilla Firefox 4 is ready to boost the future of internet with maximum security, so many in-built features, user-interface, and the browsing speed enhancement.

However, it has got a little problem, just like the other major Mozilla Firefox releases, this version also doesn’t supports the previous Add-Ons (Which are made for the earlier versions of Firefox).

Lets look into the matter, and make those old add-ons work again, in the same Firefox 4, without installing any more add-on in the firefox !

Write about:config to the Firefox Address Bar

  • Click on button – I’ll be careful, I promise
  • Perform write click (anywhere in the blank window screen) and choose New > Boolean.
  • A pop-up box will be shown to write a preference name for new key. write extensions.checkCompatibility.4.0
  • Set its value to false.

Now most of the old firefox add-ons will start working on your firefox 4 browser.

Enjoy !

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