Is there an equivalent (or working version) of the Multifox plugin for Firefox 53.0?

Question

Browser extensions

The Multifox plugin for Firefox allows you to log into several different accounts on the same site through different tabs. The most trivial example is to sit from several VKontakte accounts.
Recently (a couple of days ago) the plugin stopped working in Firefox 53.0 (Windows 7 x64 UIltimate, if that matters).
Are there analogues or a working version? Nothing was found in addons.mozilla.org, superficial googling did not help.

Answer 1

(I asked myself, I answer myself.)
There is also Cookie Swap (search in addons.mozilla.org by name).
Not as convenient as Multifox, but has similar functionality.

Answer 2

so far only in chrome there is a similar one - https://support.google.com/chrome/answer/2364824?c...
only for each account you will need to open a separate window ..
also, as an option - roll back to version 48 of the fox - mozilla -russia.org/products/firefox/history.html