In some of our labs that use Firefox, you may see a message at the bottom of the screen:
"It looks like you haven't started Firefox in a while. Do you want to clean it up for a fresh, like-new experience?"
If you see this message, please click the "X" to close rather than the "Reset Firefox..." button.
This is an "interesting" feature that was introduced into Firefox around the time that Chrome came out and there was a mass movement of FF users over to Chrome and publicity that Chrome was so much faster than FF. Part of that may have been true, but another part was that many users had been using FF for quite some time and had installed a bunch of add-ons, extensions, themes, etc. that were slowing poor FF down. The way I understand it, the logic goes that someone may have switched from FF to Chrome for the speed, but may be coming back to try FF again. In this case, the Mozilla folks want FF to be able to give its best performance, so the "Reset" option will clean out the junk and start FF up shiny and new. This process keys off of the date stamp of a file in the current user's FF profile directory, so it causes some issues for labs that are frozen in time: the last time the file was touched may have been during the VMworld 2013 Europe development cycle (before October 2013).
That may be OK for the average user, but it does not make a lot of sense in our labs. If you click the "Reset Firefox" button, it will wipe out all kinds of things, including browsing history and Bookmarks. If you inadvertently click the Reset button, you can end your lab and re-enroll.
Unfortunately, the way our labs work, "fixing the glitch" means deploying, tweaking, re-capturing, and re-shadowing each of the affected labs. This is a time-consuming process and we may not get to each of them before we begin work on the 2014 content. We have implemented a workaround for the 2014 development cycle so this should not occur with those.
Thank you for reading and thank you for supporting the labs!