Reimplement Optimistic SOCKS feature

We had to rip out the Optimistic SOCKS feature to get Moat working in Tor Browser (see: #24432 (moved)) but we want it back for performance reasons

added TorBrowserTeam201811 component::applications/tor browser owner::tbb-team priority::high severity::normal status::new tbb-performance type::defect labels

Trac:
Keywords: N/A deleted, TorBrowserTeam201805 added
Priority: Medium to High

Trac:
Keywords: tbb-preformance deleted, tbb-performance added

Trac:
Priority: High to Very High

Moving our tickets to June 2018

Trac:
Keywords: TorBrowserTeam201805 deleted, TorBrowserTeam201806 added

Moving first batch of tickets to July 2018

Trac:
Keywords: TorBrowserTeam201806 deleted, TorBrowserTeam201807 added

Putting this to a slightly less high prio right now. While performance is important, we need to make progress on the tbb-fingerprinting tickets first.

Trac:
Priority: Very High to High
Cc: arthuredelstein, sysrqb to arthuredelstein, sysrqb, pospeselr

Move our tickets to August.

Trac:
Keywords: TorBrowserTeam201807 deleted, TorBrowserTeam201808 added

Trac:
Keywords: ff60-esr deleted, N/A added

Moving our tickets to September 2018

Trac:
Keywords: TorBrowserTeam201808 deleted, TorBrowserTeam201809 added

Moving tickets to October

Trac:
Keywords: TorBrowserTeam201809 deleted, TorBrowserTeam201810 added

Moving our tickets to November.

Trac:
Keywords: TorBrowserTeam201810 deleted, TorBrowserTeam201811 added

This would be a huge win for Tor user experience.

Trac:
Cc: arthuredelstein, sysrqb, pospeselr to arthuredelstein, sysrqb, pospeselr, arma

We're probably/hopefully going to do this in #5915 (moved) so this bug could just be for using it in Tor Browser.

moved to tpo/applications/tor-browser#25555