[coldacid]

Firefox extensions _used_ to offer much more access and control of the browser, but they've since switched to a Chrome-like model that isn't near feature parity with Chrome. It was a huge step back.

[dtn]

I'm pretty sure that Firefox's model is a superset of Chrome's

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web... seems to suggest feature parity, at the very least