I have had PCs for years and have used Firefox. My PC died and will not boot. I have an image of my C:\ drive on a Passport disk. But the Mac will not read it. I installed Firefox on my new Mac and signed in had all of my bookmarks and passwords. Then there was a Firefox icon on the bottom strip and one on my screen. In the interim, I opened some new accounts and used a bunch of passwords. At the end of the day, I dragged the icon on the screen down to the row of icons at the lower screen. That wiped out my Firefox. I downloaded Firefox again and put in what I thought was the password and it said I had multiple accounts and if I changed the password it would erase all of my data. I need to find out how to get the right password so I preserve my data. The email account I used as the ID is coolsgirl@msn.com. I am 72 and I don't want to make a mistake that is irreversible. My sister said Macs were easier but I should have gotten a new PC. Live and learn. I don't know my Firefox email. Thank you, Phyllis