This plugin is very useful, simple and fast.
It just needs one improvement:
Now when it is turned off (no), the "No proxy" option is enabled in Firefox proxy settings.
Please update the plugin so that this is the default or selectable on the "Use system proxy settings" option.
Thank you

Icon is unreadable if you have a dark/black theme.

For God knows what reasons it doesn't work unless you allow it to run in private windows. Seriously?