I've been using the 4.0 alpha bundles especially the one with meek and obs4 to try them out. I've also just used the newest meek transport for Microsoft Azure listed here: https://lists.torproject.org/pipermail/tor-dev/2014-September/007525.html
My question is: Is there a way to check that the pluggable transports are actually working as advertised while you are browsing? (I'm assuming that if I click on them and the browser goes to where I ask it to, then the transport is working).
However, I'm a wee bit concerned that if the transport doesn't work, does the Tor Browser Bundle simply default to 'basic Tor' instead, thus making me visible for using Tor? Or will it simply just not work at all?
And on the same theme, if I start using pluggable transports and some time during the session it stops working, will the browser revert to 'basic Tor' or will it stop completely, forcing me to start the whole Tor Browser Bundle again using some other transport?