Thanks, works like a charm! And I know how to work with proxy, and I do not need this for firefox but only chrome, because firefox last for xp (52.9.0 esr) has all cipher suites and alghoritms, so i choose its proxy as none instead of system proxy. Also best of all since I have extension for chrome proxy switch omega, it allows me to only redirect chrome through your proxy without interference of other apps. I always thought something like this may work if proxy supports those some https sites, so i thought proxomitron or burpsuite or charles proxy could be used, but never tried them. But your apps anyway wastes much less memory, hdd, cpu, so is real solution. And you can use proxy switch omega as "offline" switch for chrome, by adding proxy like 0.0.0.0 as proxy and making it auto switch shortcut, so just one button click for offline mode. Maybe now I will use chrome again instead of firefox, because main reason for transition was inability of some https websites. Also looks like now I will be able to use internetdownloadmanager again, and actually all apps!!!
One more problem, flux application doesn't work in xp, it says in your app window: "[SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:600)" while trying to establish local SSL tunnel for [justgetflux.com:443]
It displayed this even before using your app. Should I update internet explorer or you your app?