I have tried re-booting my computer (several times) but Firefox will not open. When I click on the logo, the circle goes around a few times and then quits. This problem began yesterday (1/17/2018). Yesterday morning it appeared that some file (possibly Firefox?) performed an automatic update. Because I am unable to open the browser, I am unable to tell what version of Firefox is installed or to provide the information requested below. Recently I spent several hours cleaning up my Bookmarks, so I do NOT want to lose the "clean and well-organized" file by just deleting and re-installing Firefox before the clean Bookmarks file is made available to re-install. I had been a Firefox user from 2014 until September 2017 but had to move to another browser because Firefox was misbehaving. I recently installed Firefox on a new computer and was able to use it until yesterday.