The Add-on Compatibility Reporter, https://addons.mozilla.org/en-US/firefox/addon/add-on-compat... , should help you install incompatible add-ons. Not sure if that helps you at all.
The Add-on Compatibility Reporter, https://addons.mozilla.org/en-US/firefox/addon/add-on-compat... , should help you install incompatible add-ons. Not sure if that helps you at all.