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Firefox 78.0.2 on Mac 10.12.6 (Sierra)

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Hi! I recently got an iMac running Sierra, and installed Firefox 78.0.2. However, whenever I start it, it's blank. Each time I open it, I have to reimport my Bookmarks and Profile (to get back my saved log ins). When I ask it to display Bookmarks, I get the attached. Please advise. best wishes, Marianne

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Are you running Firefox from the installation disc or did you drag and drop it into the Applications folder?

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I downloaded it from the www and installed by dropping into Applications. I'd backed up my Profile, but I find I keep having to reinstall it every time I open Firefox. Am wondering if I need to use an earlier Firefox.