To any of those that still haven't heard:
https://blog.mozilla.org/addons/2016/11/23/add-ons-in-2017/
ELI5: Firefox will no longer support anything but WebExtensions (Chrome extensions), and is fully deprecating XUL.
So basically everything that made Firefox good to me and many others is being removed, forever. What is Mozilla thinking?
The best part is WebExtensions is totally not ready for production: it's barely half implemented and is fraught with issues, not to mention in a finished state it will offer nowhere near the amazing capability native addons have given us (even if the API has changed like 3 times now).
Using an old version of FF is of course still an option, including ESR -- but with how fast the web is evolving and growing, if you want to be able to use modern web technologies, you will probably run into issues after a while. Additionally, there is talk of deleting all incompatible (read: non-WebExtensions) addons from AMO, so you will need to either get them before that happens or get them from other sources after the fact, if they do go through with it.
As a former FF developer and lover, I am disgusted by this and previous changes. What are your all's thoughts?