Reverting internal preferences when extension is disabled/uninstalled

Add-ons Development
#1

What’s the best way to revert an about:config preference to its initial value when an XUL overlay extension is disabled or uninstalled? (It’s an extension for SeaMonkey only which is why I’m not using WebExtensions.)

#2

You can use this API to add a listener so you know when your add-on is going to change state.

#3

Thanks, that looks good!

Jorge wrote: