For some reason my automatic email signatures in Outlook Live websites (outlook.live.com and owa's) become gibberish (see attached image). I have been having this problem for a while now (aka, not only after the last Firefox update), but it is intermittent. I have already tried identifying whether the issue is in an extension or in Firefox itself, but without success. Whenever I restart Firefox in Troubleshoot mode, it solves the problem. But disabling all extensions and restarting Firefox does not. Restarting Firefox (not in Troubleshoot mode) sometimes solves the issue, as well as right after an update of the app; but not always. Starting Firefox after a computer restart usually brings the problem back. This problem also happens in my laptop (MacBookPro), so it is not restricted to this computer (macMini). I would appreciate some help in identifying the culprit, so that I may contact the appropriate support team (if not Mozilla itself).