How to use older addons in Firefox

[Disclaimer: This article is a copy-paste from here: http://www.techzilo.com/run-older-firefox-addons-hack/]

Hack to use older addons in Firefox 3.5

Here are the steps to disable extension compatibility check to use incompatible Firefox themes and addons:

Enter about:config in the address bar to bring up the about:config page.

Right-click anywhere, point to New and then to Boolean.

Disable Firefox addons compatibilty check

Enter the key extensions.checkCompatibility and hit OK.

Run older Firefox addons hack

Choose the value as false.

How to use incompatible extensions in Firefox 3.5

If you type the first few letters of extensions.checkCompatibility in the filter field, you can find the value set as false.

Run older addons in Firefox 3.5

You have to restart Firefox for the hack to be in effect.

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