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Was in the same corporate boat as you a while back. The FoxyProxy addon [1] is much more flexible, I recommend you switch to that since it enables quick toggling between the IE proxy and your configured ones.

[1] https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-sta...

FoxyProxy also lets you set different proxies for different pages. So you can run one proxy to be able to access the corporate intranet from outside, and another to access a non-public testing webpage, etc.

It does? I just upgraded to Firefox 48 and it's still the Firefox proxy settings dialog. Windows 10 here.

Just did a quick test with a clean profile and then I get the normal proxy window. I previously had several add-on installed to do some more advanced proxy settings, that probably bit me with the upgrade to Firefox 48.

That window is completely different from the proxy window in IE11. At least on Windows 7.

It gives you the choice to use the System proxy, but gives you options to specify your own.

Does it still heed HTTP_PROXY env variable under Windows?

The proxy dialog is (was?) convenient to swritch between proxies quickly; the env var, of course, cannot offer that.