How to install old, incompatible addons in firefox?

[Disclaimer: This article is a copy-paste from here:]

The addon is not compatible with firefox
Many many useful plugins aka extensions are Incompatible with the new Firefox 3.x. There are several workarounds to force them to get installed but there is one addon called Nightly Tester Tools 2.0.2 which makes it easy to install a non compatible firefox addon.

[[ Nightly Tester Tools 2.0.2 Firefox Addon ]]

After installation of this addon,whenever one tries to install an incompatible old firefox addon a windows appears prompting for force install.

Force Install a incompatible firefox addon

Note: Forcing an incompatible outdated addon to install is risky. Since the addon is not optimized for the new firefox version, it might cause frequent crashes. If that happens simply disable that addon.

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