why can not use system settings!? how could I use shadowsocks?

Not sure what to say. I'll have to say, because of the new firefox forced changes on foxyproxy, it has now become unusable for me, even since the new version before FF 57 rolled out. I had to revert to the old version to make it work when I was still using FF 56 and earlier versions. Now with FF 57, there doesn't seem to be a way to revert to earlier versions, then the current foxyproxy no longer works, even though all the proxy and patterns look the same as before.

Downthemall and flashgot and a few other important add-ons also become invalid. I guess it is time for me to abandon Firefox for good finally, despite that I have been using it (and its predecessor) for the past 20 years.

Where is the "pattern subscription"?
(e.g. how to use gfwlist)

After I imported my old FoxyProxy configuration (with whole gfw patterns), my FF57 just stuck.
When I restarted FF57, it ate up all the memory, and then it crashed.

After removing FoxyProxy, the problem disappeared.

It causes serious memory issue on Firefox 57.
The normal memory usage is about 500+M, and when I turn on foxyproxy standard and swich to pattern mode , the memory usage reachs to about 2.5+G, the total memory of my computer is 8G, this is unacceptable. Please fix this issue and hope a better proxy switcher. Peace.

I have changed my review from a 1 to 3 (for this version, 4.5.6 gets a 5/5) after working with v5 on my dev machine. I'm not keen on the new user interface and it dropping all my old proxies/rules (really need a working import) but now I have battled the new interface I can get all my proxies working as before (I have a mix of Bluecoat SG, SOCKS 5, putty SSH tunnels and Squids)

I think the issue is that Eric felt rushed release a non-lecacy version and maybe should have released this once a working import was functional and a few more of the older functions where working ie colour change icon on proxy use, more adult looking UI, same RHC function on the icon(I use this a lot).

For now I need to keep 4.6.5 on my main workstation but will move to 5 if the older function can be brought over.

@Eric - thanks for the time and effort you must put into this addon, I know it can't be easy.

OLD Review from this morning:-
I use this addon with some very complex rules and have always loved the addon, that is until v5.0, I've had to rollback to Version 4.6.5 and block auto updating, v5.0 seems like a different addon altogether, nothing imported, nothing worked and most of the features seem to be missing.

Nice to see that extension is now FF57+ compatible.
However are there any plans on restoring some old (that are currently missing) features like:
- Auto-choose proxy (based on pattern), always proxy etc,
- button icon indication of proxy usage.

Also the toolbar menu itself is a bit unnatural-looking comparing to other ones. Could you make it more similar to the coming FF57 styling guidelines?