I am using lastpass. In the last week or so, it promted me to download the latest version. I clicked onto the update, its little progress window popped up, but nothing happened... I contacted the support, they wrote i should reisntall Firefox... i said HAHA, and: With running profile-main, what ran our from Intallation-main, in the background i started installation-secondary, and created a new profile, profile-test ( it is a fully blank one). So two instances ran, with two seperate profiles. Downloaded the addon in profile-test. It promted me to update, i clicked onto it, the progress bar ran through. I closed the browser with profile-test, and returned to profile main to report what happened... But before that i checked the state of the addon in the main profile, and it changed to the updated state! What happened, and how risky or safe or usual is this? I thought profiles can not effect each other. Maybe the addons not seperating themself enough on OS level?