Toggle Proxy от Indogermane

Instead of going to Firefox-Settings -> General -> Connection settings, you can easily click the symbol of the add-on to turn on/off the proxy of Firefox.

Because the Connection settings affect private windows, too, this add-on must have the permission to run in private windows.

All of my projects are privacy friendly and open source.
Source code available here: https://codeberg.org/Indogermane/Toggle-Proxy