Firefox became too slow to start from controls account. That's because Jamie's firefox script copied all cache files (over 900Mb) and thumbnail files (over 600 Mb) to a temporary directory each time firefox was launched.

That's not all Jamie's fault, because firefox people changed the cache file naming convention in the past ('cache2' instead of 'Cache').

Anyway, Jamie's script was changed such that '[Cc]ache*' and 'thumbnail*' are excluded from rsync, and now firefox starts in a second or two. Also I deleted all caches and thumbnails. The size of firefox controls profile folder was reduced from about 1.7GB to 73MB.

Jamie's script is necessary for controls account because of the lock file management of firefox. Without the script, only one workstation at any given time can launch firefox as controls without manually deleting lock file.