Firefox has a new (well, it's at least a couple years old now) system that makes writing plugins not quite so painful: https://developer.mozilla.org/en-US/docs

Firefox has a new (well, it's at least a couple years old now) system that makes writing plugins not quite so painful: https://developer.mozilla.org/en-US/docs/Jetpack https://developer.mozilla.org/en-US/docs/Jetpack