proxy.i2p is a locally hosted tunnel that only your HTTP Proxy tunnel can visit. As such, it's a special case for the extension, since there is no great risk to visiting your own localhost in this way and since the extension needs to use it even if it doesn't know it should be using the I2P context. This concept is being extended for browsing with "pluggable" loopbacks in an experimental standalone http proxy, which provide friendly names for router console applications in the same basic way.
proxy.i2p is a locally hosted tunnel that only your HTTP Proxy tunnel can visit. As such, it's a special case for the extension, since there is no great risk to visiting your own localhost in this way and since the extension needs to use it even if it doesn't know it should be using the I2P context. This concept is being extended for browsing with "pluggable" loopbacks in an experimental standalone http proxy, which provide friendly names for router console applications in the same basic way.