Support for custom connections

[janodvarko]

It should be possible to monitor even connection that are initiated by custom clients (e.g.coming from extensions) not only the Toolbox and WebIDE

Honza

[janodvarko]

API: We probably want to utilize connect event fired by DebuggerClient.prototype.connect() method.

UI/UX: One option is to create a new tab in the Connection List window.
Existing tabs: Local Tabs, WebIDE
New tab: Other

Honza

[janodvarko]

Here is an extension that creates a connection to the backend (Toolbox not opened):

https://github.com/firebug/har-export-trigger/

If you set extensions.netmonitor.har.autoConnect preference to true, the extension automatically connect to the backend (through a custom connection) immediately after Firefox starts.

Btw. the extension exports HAR API into the page (content scope) HAR.triggerExport and HAR.clear. If it's useful for testing I could also expose something like HAR.disconnect that closes the connection, so we can test whether the Connection List window is properly updated.

Honza