The problem appears to be more extensive than just jumplists. Having performed a ccleaner custom clean with all conceivable wipe options selected I reopened firefox and navigated to youtube expecting to start a new log in and guess what, I find myself still logged in to my account!
Tried this a dozen times in a row. Closed Firefox, let cceaner autoclean, then opened ccleaner to do a manual clean, reopened firefox and navigated to you youtube and.......... I'm still logged in to gmail and youtube. Interestingly, for a brief moment on loading the youtube's homepage it doesn't appear that I'm logged in but suddenly the page does a reloads and logs me right back in.
Currently the only reliable way to clean my browser history and logins is by doing it manual clean through the firefox browser itself. I have no idea what on earth is going on here but as things stand CCleaner is redundant and not fit for purpose.
Any CCleaner programmers wish to comment?