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The about:support API replaces the Troubleshooter Add-on and is available starting in Firefox 35. To test this locally during development, you need to run an ssl server and change some permissions in your browser.
To run the ssl server, first add sslserver to INSTALLED_APPS in settings_local.py:
INSTALLED_APPS = list(INSTALLED_APPS) + ['sslserver']
Run the ssl server:
$ ./manage.py runsslserver
Then you need to run the following in the Browser Console:
Services.perms.add(Services.io.newURI("https://localhost:8000", null, null), "remote-troubleshooting", Services.perms.ALLOW_ACTION);
You need to Enable chrome debugging in developer console settings, so that you can access the browser console.
This should probably be somewhere else, but the easy way to flush your cache is something like this:
echo "flush_all" | nc localhost 11211
Assuming you have memcache configured to listen to 11211.