Suggestions for user interface improvements

[speters]

Thanks for this addon!

Maybe you could implement some minor improvements:

• add enable/disable config item for each proxy, so that "next" and "previous" proxy only cycles between active/configured ones (would also fix https://github.com/rNeomy/proxy-switcher/issues/27)
• add a color of the proxy icon to the config tabs, so that it's easier to learn which color corresponds to which proxy
• make colors configurable or use icon colors that don't interfere with common red=off/alert/.. green=on/ok/... sense (see https://github.com/rNeomy/proxy-switcher/issues/20)
• add name of active proxy to the hover-over icon tooltip
• Improve "Use this proxy server for all protocols", which is misleading for SOCKS proxies IMO

[KrzysztofJozefowicz]

regarding point 2 and 3 (#20), there is an visibility issue with FireFox default dark theme (at least in 59) for "Direct Proxy". "Direct Proxy" is almost not visible, it would be good to be able to define custom colors for each of proxy category

[rNeomy]

The new icon for 0.3.6 looks good on dark themes