Merely uninstalling Firefox thru the Firefox uninstall feature shouldn't have resulted in the loss of your bookmarks or any other Firefox data. https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer Now if you used '''Remove user data and settings''' at the bottom of that '''''uninstall-firefox-from-your-computer''''' support article, I hope you saved the files that you removed so that we can guide you with reinstalling that data. '''If''' you used a 3rd party application, like REVOuninstaller you're probably SOL.